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> N.B. If you're interested in building Midipix using this script, please join
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the project's IRC channel #midipix on Libera and ask for the address of the
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internal repositories required in order to build Midipix.
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[//]: # "{{{ Table of contents"
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# Table of Contents
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1. [What is midipix, and how is it different?](#1-what-is-midipix-and-how-is-it-different)  
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2. [Building and deployment](#2-building-and-deployment)  
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	2.1. [Building, installing, and using a midipix distribution](#21-building-installing-and-using-a-midipix-distribution)  
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		2.1.1. [Build-time dependencies](#211-build-time-dependencies)  
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			2.1.1.1. [Alpine-specific notate bene](#2111-alpine-specific-notate-bene)  
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	2.2. [Deployment](#22-deployment)  
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	2.3. [System requirements](#23-system-requirements)  
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	2.4. [Troubleshooting](#24-troubleshooting)  
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3. [Common concepts and tasks](#3-common-concepts-and-tasks)  
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	3.1. [Common tasks](#31-common-tasks)  
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	3.2. [Adding a package](#32-adding-a-package)  
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	3.3. [Addressing build failure](#33-addressing-build-failure)  
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	3.4. [Package archive files and Git repositories](#34-package-archive-files-and-git-repositories)  
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	3.5. [``-s``: package build shell environment](#35--s-package-build-shell-environment)  
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	3.6. [Package-package and {package,group}-group relationships](#36-package-package-and-packagegroup-group-relationships)  
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	3.7. [Patches and ``vars`` files](#37-patches-and-vars-files)  
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4. [Units reference](#4-units-reference)  
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	4.1. [Build steps](#41-build-steps)  
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	4.2. [Build variables](#42-build-variables)  
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	4.3. [Fault-tolerant & highly optimised 3D laser show-equipped usage screen](#43-fault-tolerant--highly-optimised-3d-laser-show-equipped-usage-screen)  
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	4.4. [File installation DSL](#44-file-installation-dsl)  
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	4.5. [Package variables](#45-package-variables)  
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		4.5.1. [Package variable types](#451-package-variable-types)  
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		4.5.2. [Package variables](#452-package-variables)  
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	4.6. [``pkgtool.sh``](#46-pkgtoolsh)  
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5. [References](#5-references)  
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[//]: "}}}"
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[//]: # "{{{ 1. What is midipix, and how is it different?"
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## 1. What is midipix, and how is it different?
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midipix is a development environment that lets you create programs
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for Windows using the standard C and POSIX APIs. No compromises made,
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no shortcuts taken.  
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If you are interested in cross-platform programming that reclaims
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the notion of write once, compile everywhere; if you believe that the
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'standard' in the C Standard Library should not be a null signifier;
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and if you like cooking your code without #ifdef hell and low-level
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minutiae, then this page is for you.  
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midipix makes cross-platform programming better, simpler and faster,
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specifically by bringing a modern, conforming C Runtime Library to the
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Windows platform. While the idea itself is not new, the approach taken
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in midipix to code portability is radically different from that found
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in other projects.  
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*(reproduced from [[2](https://midipix.org/#sec-midipix)])*
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[Back to top](#table-of-contents)
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[//]: "}}}"
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[//]: # "{{{ 2. Building and deployment"
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## 2. Building and deployment
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[//]: # "}}}"
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[//]: # "{{{ 2.1. Building, installing, and using a midipix distribution"
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### 2.1. Building, installing and using a midipix distribution
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A Midipix distribution consists of the following:
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* the native Midipix toolchain, consisting of perk, gcc, its dependencies,
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  and binutils,
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* musl, a lightweight, fast, simple, and free libc[[1](https://www.musl-libc.org/faq.html)] used by Midipix,
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* the Midipix runtime components that bridge the gap between the libc and the
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  executive subsystems of all Windows NT-derived Windows OS starting with and
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  including Windows XP, and
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* a steadily increasing number of 3rd party open source packages, as expected in
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  any modern POSIX-compliant \*nix environment, including GNU coreutils, shells,
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  libraries such as ncurses, libressl, as well as Perl and Python.
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Install the build-time dependencies listed in section [2.1.1](#211-build-time-dependencies),
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clone this repository (e.g. ``git clone https://dev.midipix.org/build/midipix_build``)
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and run the following command line:
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```shell
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./build.sh -a nt64 -b release -D zipdist -P -v
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```
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By default, the build will take place within ``${HOME}/midipix/nt64/release``
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and package archive files and/or Git repositores will be downloaded into
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``${HOME}/midipix/dlcache``. Consult sections [4.2](#42-build-variables) and
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[4.5](#45-package-variables) for the list of available build/package variables
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and how to override them.  
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Parallelisation is enabled by the above command line for both packages that can
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be built independently of each other and ``make(1)`` via ``-j``, limited to the
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amount of logical processors on the build host divided by two (2).
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.1.1. Build-time dependencies"
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### 2.1.1. Build-time dependencies
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* **Alpine Linux**:
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  binutils bzip2 cmake coreutils curl findutils g++ gawk gcc git grep gzip libc-dev linux-headers lzip make musl-dev net-tools patch perl perl-xml-parser procps sed tar util-linux wget xz zip
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* **Debian/-derived Linux**:
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  binutils bzip2 clzip cmake coreutils curl findutils g++ gawk gcc git grep gzip hostname libc6-dev libxml-parser-perl lzma make patch perl procps sed tar util-linux wget xz-utils zip
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* **Gentoo Linux**:
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  binutils bzip2 cmake coreutils curl findutils gawk =gcc-7.5.0-r1 dev-vcs/git grep gzip lzip make patch perl dev-perl/XML-Parser procps sed tar util-linux wget xz-utils zip
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* **OpenSUSE Linux**:
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  binutils bzip2 cmake coreutils curl findutils gawk gcc gcc-c++ git grep gzip hostname linux-glibc-devel lzip make patch perl perl-XML-Parser procps sed tar util-linux wget xz zip
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> N.B. Busybox is not supported. Awk implementations other than GNU Awk are not supported.  
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> N.B. gcc versions >7.5.0 are not supported. clang is not supported.  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.1.1.1. Alpine-specific notate bene"
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#### 2.1.1.1. Alpine-specific notate bene
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Some packages (*coreutils*, *grep*, and *tar*, among others) override Alpine's
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BusyBox utilities of the same name, as the latter are either non-conformant or
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defective.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.2. Deployment"
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### 2.2. Deployment
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On successful completion of the build, a ZIP archive containing the Midipix
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distribution will be created inside ``${PREFIX}`` (see section [4.2](#42-build-variables).)
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Create a directory on the target machine and extract the contents of the distribution
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ZIP archive into it, run ``bash.bat``, and then ``/install.sh`` inside the resulting
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self-contained Midipix installation shell window.  
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> N.B. The pathname of the target directory containing ``bash.bat`` and all other
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distribution files must not contain whitespaces.  
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> N.B. The Midipix installer defaults to ``/dev/fs/c/midipix (C:\midipix)``. If left
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unchanged, the distribution ZIP archive must not be extracted into a directory of the
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same pathname.  
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> N.B. The user installing and using Midipix must have been delegated the ``SeCreateSymbolicLinkPrivilege``
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("Create symbolic links") privilege[[3](https://docs.microsoft.com/en-us/windows/security/threat-protection/security-policy-settings/user-rights-assignment)] and additionally be a non-administrator account
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owing to the UAC-related filtering policy of tokens introduced by Windows Vista[[4](https://docs.microsoft.com/en-us/previous-versions/dotnet/articles/bb530410%28v%3dmsdn%2e10%29)].  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.3. System requirements"
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### 2.3. System requirements
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The following build-time system requirements are assessed on build hosts
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equipped with the following hardware at minimum:
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* Intel(R) Xeon(R) CPU W3520 @ 2.67GHz (8 cores)
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* 7200 RPM SATA 3.1 HDD
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* 6 GB RAM
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| Target architecture | Build kind | Distribution kinds selected | Average build time | Disk space required | Peak RAM usage |
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| ------------------- | ---------- | --------------------------- | ------------------ | ------------------- | -------------- |
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| nt64                | debug      | (none)                      | 2 hours            | 57.62 GB            | 3.55 GB        |
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| nt64                | release    | (none)                      | 1 hours 45 minutes | 36.51 GB            | 3.21 GB        |
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Package archive files and/or Git repositories additionally consume at least
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1.82 GB.
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*(last update: Thu, 05 Mar 2020 09:25:41 +0000)*
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These are the Midipix distribution disk space system requirements:
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| Target architecture | Build kind | Distribution | Installation directory | Archive file |
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| ------------------- | ---------- | ------------ | ---------------------- | ------------ |
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| nt64                | debug      | 7.3 GB       |  2.3 GB                | 2.1 GB       |
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| nt64                | release    | 3.2 GB       |  913 MB                | 830 MB       |
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The installation directory and archive file may be safely deleted post-installation.
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*(last update: Thu, 07 Jan 2021 18:20:06 +0000)*
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 2.4. Troubleshooting"
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### 2.4. Troubleshooting
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Midipix presently provides, inter alia, strace-like functionality via
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ntctty's logging capabilities. This is available both through the regular
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``strace(1)`` command as distributed, which however **must** be provided
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with an absolute pathname without consideration for ``${PATH}``, as well
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as directly via ``ntctty.exe`` for a session by running ``ntctty.exe``
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with the ``--log-level 7`` option, e.g.:
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```shell
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$ #strace ls -la /        # (incorrect, relative pathname)
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$ strace /bin/ls -la /    # (correct, absolute pathname)
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$ ntctty.exe --log-level 7 -e /bin/ls -la /
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$ ntctty.exe --log-level=7 -e /bin/ls -la /
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$ ntctty.exe --log-level 7 -e /bin/sh -c "ls -la /"
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$ ntctty.exe --log-level=7 -e /bin/sh -c "ls -la /"
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```
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By default, ``ntctty.exe`` log files are written into the /var/log/ntctty
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directory; this may be adjusted with the ``--log-dir`` and/or
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``--log-file`` options. ``strace(1)`` logs to stderr by default.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3. Common concepts and tasks"
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## 3. Common concepts and tasks
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[//]: # "}}}"
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[//]: # "{{{ 3.1. Common tasks"
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### 3.1. Common tasks
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Rebuild set of packages in isolation:
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```shell
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./build.sh [ ... ] -r mc,zsh
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```
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Restart the ``@install`` (shorthand alias) step, with implicit ``finish``, of the
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``mc`` and ``zsh`` packages.
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```shell
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./build.sh [ ... ] -r mc,zsh:@install
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```
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Rebuild set of packages along w/ their dependencies, if any, as needed, or forcibly,
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respectively:
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```shell
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./build.sh [ ... ] -r \*mc,zsh
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./build.sh [ ... ] -r \*\*mc,zsh
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```
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Forcibly rebuild all reverse dependencies of a set of packages:
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```shell
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./build.sh [ ... ] -r \*\*\*glib,libflac
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```
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Restart the ``@configure``, ``@build``, and ``@install`` (shorthand alias) steps of the
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``coreutils`` package:
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```shell
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./build.sh -r coreutils:@configure,@build,@install
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```
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Rebuild entire build groups including or excluding group dependencies, respectively:
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```shell
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./build.sh [ ... ] -r ALL native_runtime
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./build.sh [ ... ] -r ALL =native_runtime
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```
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Forcibly (re)download all archive files and/or Git repositories associated with all packages:
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```shell
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./build.sh [ ... ] -r ALL:@fetch
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```
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.2. Adding a package"
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## 3.2. Adding a package
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Packages are grouped into *build groups* according to sets of common package
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variable defaults, such as ``${PKG_CFLAGS_CONFIGURE}, ${PKG_LDFLAGS_CONFIGURE}``
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and ``${PKG_CONFIGURE_ARGS}``, and semantic interrelatedness, such as the
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``native_runtime`` build group comprising the Midipix runtime components.
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Packages may belong to more than one build group such as when subsumed by a shorthand
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build group e.g. the ``dev_packages`` build group, as long as the default set of build
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groups or as overriden on the command line does not entail group membership conflicts.  
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Build groups files beneath ``groups/`` named ``[0-9][0-9][0-9].<group name>.group``
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contain package variable defaults, the alphabetically sorted list of contained
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packages in ``<upper case group name>_PACKAGES``, and their package variables
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sorted alphabetically with the exception of ``${PKG_DEPENDS}`` (if present,)
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``${PKG_SHA256SUM}``, ``${PKG_URL}``, and ``${PKG_VERSION}``, and/or ``${PKG_URLS_GIT}``,
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which are specified in this order.  
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Pick a build group according to the criteria mentioned, add the package to the
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build group's list of contained packages in its corresponding file, and add the
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set of package variables required (see above and section [4.5](#45-package-variables).)  
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Consult section [3.7](#37-patches-and-vars-files) if the package to be added
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requires patches or additional code amending or replacing package build steps
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or the entire package build. Consult section [4.1](#41-build-steps) for a list
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of package build steps and how they are overriden.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.3. Addressing build failure"
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## 3.3. Addressing build failure
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During package build, standard error and output are redirected into a log file beneath
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``${BUILD_WORKDIR}`` named ``${PKG_NAME}_stderrout.log``, following a package variable
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dump. If ``-V build`` was specified, package logs will additionally be printed to standard
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output. If ``-V xtrace`` was specified, ``xtrace`` will be set during package builds for
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rudimentary debugging purposes. Additionally, packages using GNU autotools will, if
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package configuration failed or appears relevant, log the configuration process in detail
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in, most usually, ``${PKG_BUILD_DIR}/config.log``.  
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If ``--dump-on-abort`` was specified, a subset of the variables set and environment
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variables exported will be written to ``${BUILD_WORKDIR}/${PKG_NAME}.dump``, which may
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subsequently be used in order to obtain a package build shell environment with the
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``pkgtool.sh`` script (see sections [4.6](#46-pkgtoolsh), [3.5](#35--s-package-build-shell-environment).)
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.4. Package archive files and Git repositories"
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### 3.4. Package archive files and Git repositories
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Packages may have either or both of a SHA-256 message digest checked and to be extracted tarball
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(set in ``${PKG_URL}``, ``${PKG_FNAME}``, and ``${PKG_SHA256SUM}``) and/or Git repository or set
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thereof (set in ``${PKG_URLS_GIT}``.) Complementing these, an implicitly inferred or, in the
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presence of both, explicit primary source directory is specified for each package in ``${PKG_SUBDIR}``.
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Furthermore, these may be subject to download caching and/or setting up as well as maintaining
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mirrors, including automatic cleanup as well as deduplication in both cases.  
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A list of pertinent package variables and their formats follows:  
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| Name           | Format                                          |
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| -------------- | ----------------------------------------------- |
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| PKG_FNAME      | ``<single file name>``                          |
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| PKG_SHA256SUM  | ``<SHA-256 message digest>``                    |
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| PKG_SUBDIR     | ``<relative or single directory name>``         |
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| PKG_URL        | ``scheme:[//authority]path[?query][#fragment]`` |
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| PKG_URLS_GIT   | ``[subdir=]URL[@branch]``                       |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.5. -s: package build shell environment"
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### 3.5. -s: package build shell environment
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When ``build.sh`` is executed with the ``--dump-on-abort`` option, a subset of the
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variables set and environment variables exported will be written to ``${BUILD_WORKDIR}/${PKG_NAME}.dump``
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on build failure, which may subsequently be used in order to obtain a package build shell
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environment with the ``pkgtool.sh`` script, e.g.:  
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```
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midipix_build@sandbox:(src/midipix_build)> $ ./pkgtool.sh -a nt64 -b debug -s mc
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==> 2020/03/11 15:46:28 Launching shell `/usr/bin/zsh' within package environment and `/home/midipix_build/midipix/nt64/debug/tmp'.
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==> 2020/03/11 15:46:28 Run $R to rebuild `mc'.
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==> 2020/03/11 15:46:28 Run $RS <step> to restart the specified build step of `mc'
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==> 2020/03/11 15:46:28 Run $D to automatically regenerate the patch for `mc'.
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midipix_build@sandbox:(mc-native-x86_64-nt64-midipix/obj)> $
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```
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If a package build shell environment is desired for a package that has either not been
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built at all or built successfully, ``pkgshell.sh`` will attempt to rebuild the package
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at build steps up until, by default, ``build``, and then forcibly abort the build and
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write ``${BUILD_WORKDIR}/${PKG_NAME}.dump`` as above prior to entering the shell.  
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Consult sections [3.2](#32-adding-a-package), [3.7](#37-patches-and-vars-files), [4.2](#42-build-variables),
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[4.1](#41-build-steps), and [4.5](#45-package-variables) for further information
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concerning the package build process.  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.6. Package-package and {package,group}-group relationships"
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### 3.6. Package-package and {package,group}-group relationships
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Packages, as well as groups, are interrelated through implicit as well as explicit parametrised,
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typed relationships and form namespaces correspondingly.  
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These primarily, by expressing modalities of constraining, derivation, and/or subdividision, govern
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the build and mirroring, etc. processes with regard to ordering constraints (e.g. ``depends``)
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and derivation or sharing of sets of variables and/or patches and/or ``vars/`` files (e.g.
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``group``, ``flavour``, ``inherit``) or build and/or source directories (e.g. ``module``,) etc.  
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They may, however, also be subject to enquiry for descriptive, diagnostic, or visualising purposes,
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particularly as concerns the namespaces they form.  
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A list of relationship types follows:  
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| Type     | Mode     | Description                                                                                                                            |
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| -------- | -------- | -------------------------------------------------------------------------------------------------------------------------------------- |
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| depends  | implicit | Direct and recursively evaluated package dependency                                                                                    |
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| suggests | explicit | Suggested or recommended optional package                                                                                              |
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| group    | implicit | Simple and overridable group variable inheritance (e.g. ``host_toolchain``, ``native_packages``)                                       |
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| inherit  | both     | Simple and overridable package variable inheritance                                                                                    |
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| flavour  | explicit | Exclusive package flavours set membership (e.g. ``vim_gtk``, ``vim_x11``) (conflicts w/ ``module``)                                    |
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| module   | explicit | Package modularisation with implicit source and build directory sharing (e.g. ``gcc_stage1``, ``gcc_full``) (conflicts w/ ``flavour``) |
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| target   | both     | Simple super- or subset derivation (e.g. ``host``, ``minipix``)                                                                        |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 3.7. Patches and ``vars`` files"
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## 3.7. Patches and ``vars`` files
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Package patches are applied prior and/or subsequent to (GNU autotools or similar) package
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configuration during the ``configure_patch_pre`` and/or ``configure_patch`` build steps,
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respectively (see section [4.1](#41-build-steps).) Patch files are searched for beneath
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``patches/`` with the following globs and in-order:
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* ``${PKG_NAME}-${PKG_VERSION}_pre.local.patch``
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  or ``${PKG_NAME}_pre.local.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}-${PKG_VERSION}_pre.local@${BUILD_HNAME}.patch``
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  or ``${PKG_NAME}_pre.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}/*.patch``
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* ``${PKG_NAME}-${PKG_VERSION}.local.patch``
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  or ``${PKG_NAME}.local.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_NAME}-${PKG_VERSION}.local@${BUILD_HNAME}.patch``
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  or ``${PKG_NAME}.local@${BUILD_HNAME}.patch`` (for packages lacking ``${PKG_VERSION}``)
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* ``${PKG_PATCHES_EXTRA}`` (if set)
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If the default set of package build steps does not suffice, such as if additional commands
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must be executed after package configuration or prior to building, or if an entire or all
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build step must be replaced, overrides may be specified in the form of functions in the
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package's ``vars/${PKG_NAME}.vars`` ``vars`` file. Consult section [4.1](#41-build-steps)
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for a list of package build steps and how they are overriden.
Lucio Andrés Illanes Albornoz 531158
  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4. Units reference"
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## 4. Units reference
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[//]: # "}}}"
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[//]: # "{{{ 4.1. Build steps"
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## 4.1. Build steps
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Package builds are divided up into consecutively executed build steps until
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completion or aborted on failure unless relaxed mode is enabled by passing
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``-R``.  
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Each build step corresponds to a function in the corresponding ``subr/pkg_*.subr``
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script and may be overriden entirely by a function named ``pkg_<package name>_<build step>()``
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or composed in terms of prior and/or subsequent execution by a function named
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``pkg_<package name>_<build step>_pre()`` and/or ``pkg_<package name>_<build step>_post()``,
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respectively, in the package's ``vars`` file. If a function named ``pkg_<package name>_all()``
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exists, it will override all build steps.  
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Build step status is tracked on a per-package basis by state files beneath
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``${BUILD_WORKDIR}`` following the format ``.<package name>.<build step>``;
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package build completion corresponds to the pseudo-build step ``finish``.
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| Name                | Description                                                                                                                                                                                                           |
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| ------------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
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| fetch_clean         | Delete and create ``${PKG_SUBDIR}''                                                                                                                                                                                   |
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| fetch_download      | Download package archive & verify w/ SHA-256 message digest and/or clone Git repository/ies                                                                                                                           |
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| fetch_extract       | Extract package archive, if any                                                                                                                                                                                       |
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| configure_clean     | Delete and create ``${PKG_BUILD_DIR}''                                                                                                                                                                                |
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| configure_patch_pre | Apply ``chainport`` patches and/or patches beneath ``patches/`` prior to (GNU autotools or similar) configuration                                                                                                     |
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| configure_autotools | Bootstrap (GNU autools or similar) environment, and install ``config.sub`` and ``config.cache``                                                                                                                       |
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| configure_patch     | Apply patches beneath ``patches/`` and/or set in ``${PKG_PATCHES_EXTRA}`` after (GNU autotools or similar) configuration                                                                                              |
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| configure           | Perform package (GNU autools or similar or CMake) configuration w/ configuration-time set of environment variables                                                                                                    |
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| build_clean         | Clean ``${PKG_BUILD_DIR}'' w/ ``make clean'' invocation                                                                                                                                                               |
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| build               | Call ``make(1)`` w/ build-time set of make variables                                                                                                                                                                  |
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| install_clean       | Delete and create ``${PKG_DESTDIR}''                                                                                                                                                                                  |
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| install_subdirs     | Create default directory hierarchy in ``${PKG_DESTDIR}``, optionally amended w/ ``${PKG_INSTALL_FILES_DESTDIR_EXTRA}``                                                                                                |
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| install_make        | Call ``make(1)`` w/ ``${PKG_INSTALL_TARGET}`` (defaults to ``install``) and installation-time set of make variables                                                                                                   |
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| install_files       | Install ``${PKG_INSTALL_FILES}``, fix directory and file mode bits within ``${PKG_DESTDIR}`` and optionally ``${PKG_DESTDIR_HOST}``, ``pkgconf(1)`` package files, and/or stripped binaries within ``${PKG_DESTDIR}`` |
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| install_libs        | Purge libtool ``.la`` files and install shared objects within ``${PKG_DESTDIR}`` w/ ``perk`` and corresponding symbolic links                                                                                         |
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| install             | Install into ``${PKG_PREFIX}``, and optionally ``${PKG_DESTDIR_HOST}`` into ``${PREFIX}``, under mutex, and add package to ``${PREFIX}/pkglist.${PKG_BUILD_TYPE}`` (unless inhibited)                                 |
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| install_rpm         | Build package RPM w/ auto-generated specifiation file based on ``etc/package.spec`` beneath ``${PREFIX_RPM}``                                                                                                         |
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| clean               | Clean ``${PKG_BUILD_DIR}`` and/or ``${PKG_DESTDIR}`` and/or ``${PKG_DESTDIR_HOST}`` and/or ``${PKG_BASE_DIR}/${PKG_SUBDIR}`` as per ``-C build,dest,src``, resp., if any                                              |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4.2. Build variables"
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## 4.2. Build variables
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The following variables are primarily defined in ``midipix.env`` and may be
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overriden on a per-build basis on the command-line, the environment, and/or
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``${HOME}/midipix_build.vars``, ``${HOME}/.midipix_build.vars``, and/or
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``../midipix_build.vars``, e.g.:
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```shell
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./build.sh -a nt64 -b release -D minipix,zipdist -P -v PREFIX_ROOT="${HOME}/midipix_tmp"
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env ARCH=nt64 BUILD_KIND=release PREFIX_ROOT="${HOME}/midipix_tmp" ./build.sh -D minipix,zipdist -P -v
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```
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| Variable name    | Default value                        | Description                                                                   |
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| ---------------- | ------------------------------------ | ----------------------------------------------------------------------------- |
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| ARCH             | nt64                                 | Target 32-bit (nt32) or 64-bit (nt64) architecture                            |
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| BUILD_DLCACHEDIR | ${PREFIX_ROOT}/dlcache               | Absolute pathname to package downloads cache root directory                   |
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| BUILD_HNAME      | $(hostname)                          | Build system hostname                                                         |
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| BUILD_KIND       | debug                                | Build w/ debugging (debug) or release compiler flags                          |
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| BUILD_WORKDIR    | ${PREFIX}/tmp                        | Absolute pathname to temporary package build root directory                   |
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| PREFIX           | ${PREFIX_ROOT}/${ARCH}/${BUILD_KIND} | Absolute pathname to architecture- & build type-specific build root directory |
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| PREFIX_CROSS     | ${PREFIX}/${DEFAULT_TARGET}          | Absolute pathname to toolchain root directory                                 |
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| PREFIX_MINGW32   | ${PREFIX}/x86_64-w64-mingw32         | Absolute pathname to MinGW toolchain root directory                           |
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| PREFIX_MINIPIX   | ${PREFIX}/minipix                    | Absolute pathname to minipix distribution root directory                      |
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| PREFIX_NATIVE    | ${PREFIX}/native                     | Absolute pathname to cross-compiled packages root directory                   |
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| PREFIX_ROOT      | ${HOME}/midipix                      | Absolute pathname to top-level directory                                      |
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| PREFIX_RPM       | ${PREFIX}/rpm                        | Absolute pathname to package RPM archive root directory                       |
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4.3. Fault-tolerant & highly optimised 3D laser show-equipped usage screen"
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## 4.3. Fault-tolerant & highly optimised 3D laser show-equipped usage screen
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```
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usage: ./build.sh [-a nt32|nt64]  [-b debug|release]    [-C dir[,..]]  [-D kind[,..]]
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                  [-F ipv4|ipv6|offline]    [-h|--help] [-p jobs|-P]    [-r ALL|LAST]
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                  [-r [*[*[*]]]name[,..][:ALL|LAST|[^|<|<=|>|>=]step,..]]        [-R]
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		  [-v] [-V [+]tag|pat[,..]]
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                  [--as-needed]  [--debug-minipix] [--dump-on-abort]  [--reset-state]
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                  [--roar]      [[=]<group>|<variable name>=<variable override>[ ..]]
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        -a nt32|nt64        Selects 32-bit or 64-bit architecture; defaults to nt64.
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        -b debug|release    Selects debug or release build kind; defaults to debug.
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        -C dir[,..]         Clean build directory (build,) ${PREFIX} before processing build
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                            scripts (prefix,) source directory (src,) and/or destination
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                            directory (dest) after successful package builds.
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        -D kind[,..]        Produce minimal midipix distribution directory (minipix,) RPM
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                            binary packages (rpm,) and/or deployable distribution ZIP
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                            archive (zipdist.) zipdist implies minipix.
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        -F ipv4|ipv6|offline
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                            Force IPv4 (ipv4) or IPv6 (ipv6) when downloading package
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                            archives and/or Git repositories or don't download either at all
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                            (offline.)
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        -h|--help           Show short/full help screen, respectively.
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        -p jobs|-P          Enables parallelisation at group-level, whenever applicable.
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                            The maximum count of jobs defaults to the number of logical
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                            processors on the host system divided by two (2.)
Lucio Andrés Illanes Albornoz b1d432

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                            If -R is not specified and at least one (1) package fails to
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                            build, all remaining package builds will be forcibly aborted.
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        -r ALL|LAST         Restart all packages or the last failed package and resume
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                            build, resp.
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        -r [*[*[*]]]name[,..][:ALL|LAST|[^|<|<=|>|>=]step,..]
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                            Restart the specified comma-separated package(s) w/ inhibition
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                            of package build step state resetting completely (`ALL',) starting
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                            at the resp. last successfully executed build steps (`LAST',) or the
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                            specified comma-separated list of build steps, optionally subject
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                            concerning package name(s) and/or build step(s) to the below modifiers:
Lucio Andrés Illanes Albornoz b1d432

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                            Prepend name w/ `*' to automatically include dependencies, `**'
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                            to forcibly rebuild all dependencies, and `***' to forcibly
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                            rebuild all packages that depend on the specified package(s).
Lucio Andrés Illanes Albornoz b1d432

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                            Prepend step w/ `^' to filter build steps with, `<' or `<='
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                            to constrain build steps to below or below or equal with, resp.,
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                            `>' or `>=' to constrain build steps to above or above or equal
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                            with, resp.
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                            Currently defined build steps are:
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                            fetch_clean, fetch_download, fetch_extract, configure_clean,
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                            configure_patch_pre, configure_autotools, configure_patch,
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                            configure, build_clean, build, install_clean, install_subdirs,
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                            install_make, install_files, install_libs, install, install_rpm,
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                            and clean.
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                            Additionally, the following virtual steps are provided:
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                            @fetch, @configure, @build, @install, @clean, and finish.
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        -R                  Ignore build failures, skip printing package logs, and continue
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                            building (relaxed mode.)
Lucio Andrés Illanes Albornoz b1d432

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        -v                  Increase logging verbosity.
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        -V [+]tag|pat[,..]  Enable logging for messages with tag or pattern matching tags of:
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                            + (prefix)..: initialise tags with normal verbosity (implies normal) (see etc/build.theme,)
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                            all.........: log everything (see etc/build.theme,)
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                            clear|none..: log nothing,
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                            normal......: log at normal verbosity (see etc/build.theme,)
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                            verbose.....: log at increased verbosity (implies normal) (see etc/build.theme) (-v,)
Lucio Andrés Illanes Albornoz b1d432

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                            build.......: log package build logs,
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                            fileops.....: log RTL file operations,
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                            install.....: log RTL installation DSL operations,
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                            zipdist.....: log deployable distribution ZIP archive operations,
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                            xtrace......: set xtrace during package builds,
Lucio Andrés Illanes Albornoz b1d432

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                            fatal.......: fatal, unrecoverable errors,
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                            info........: informational messages,
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                            verbose.....: verbose informational messages,
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                            warning.....: warning messages possibly relating to imminent fatal, unrecoverable errors,
Lucio Andrés Illanes Albornoz b1d432

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                            build_*.....: general build messages (viz.: begin, finish, finish_time, vars,)
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                            group_*.....: build group messages (viz.: begin, finish,)
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                            pkg_*.......: package build messages (viz.: begin, faildump, finish, msg, skip, step, strip.)
Lucio Andrés Illanes Albornoz b1d432

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        --as-needed         Don't build unless the midipix_build repository has received
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                            new commits.
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        --debug-minipix     Don't strip(1) minipix binaries to facilitate debugging minipix.
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        --dump-on-abort     Produce package environment dump files on build failure to be
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                            used in conjuction with pkg_shell.sh script (excludes -R.)
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        --reset-state       Reset package build step state on exit.
Lucio Andrés Illanes Albornoz b1d432

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        <group>[ ..]        One of: dev_packages, dist, host_deps, host_deps_rpm,
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                            host_toolchain, host_tools, minipix, native_packages,
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                            native_runtime, native_toolchain, native_tools.
Lucio Andrés Illanes Albornoz b1d432

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                            Prepend w/ `=' to inhibit group-group dependency expansion.
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        <variable name>=<variable override>[ ..]
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                            Override build or package variable.
Lucio Andrés Illanes Albornoz 531158
```
Lucio Andrés Illanes Albornoz 531158
  
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[Back to top](#table-of-contents)
Lucio Andrés Illanes Albornoz 531158

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[//]: # "}}}"
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[//]: # "{{{ 4.4. File installation DSL"
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## 4.4. File installation DSL
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File and directory installation, comprising e.g. copying, moving, creating
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symbolic links, setting owner and/or permission metadata, are expressed in
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a descriptive domain-specific language and integrated with package building
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via the package variables ``${PKG_INSTALL_FILES}``, applying during ``install_files``
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after the ``install_make`` build step,``${PKG_INSTALL_FILES_DESTDIR}`` and
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``${PKG_INSTALL_FILES_DESTDIR_EXTRA}`` during ``install_subdirs`` with the
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following syntax specified in EBNF:  
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```
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(*
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SH_GLOB_PATTERN      = any valid portable shell pattern (see sh(1)); superset of PATHNAME
Lucio Andrés Illanes Albornoz 531158
SH_SUBSTRING_PATTERN = any valid portable substring processing shell pattern (see sh(1));
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                       superset of PATHNAME
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PARAMETER            = any valid portable shell variable name except that [0-9] may occur
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                       the beginning
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PATHNAME             = any valid filename, directory name, relative or absolute pathname
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                       excluding the characters NUL and NL
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 *)
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spec                 = { op_flag, } op_unary, "=", op_spec, "\n", { spec } ;
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                     | { op_flag, } op_binary, op_spec, "=" op_spec, "\n", { spec } ;
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                     | "#" COMMENT ;
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op_unary             = "-" | "/" | "t" ;
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op_binary            = ":" | "!" | "@" | "+" | "g" | "m" | "o" | "T" ;
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op_flag              = "?" ;
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op_spec              = pattern_spec | PATHNAME | expr_spec | op_spec ;
Lucio Andrés Illanes Albornoz 531158

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pattern_spec         = "%<", SH_GLOB_PATTERN, ">" ;
Lucio Andrés Illanes Albornoz 531158

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expr_spec            = "%[", expr, { sexpr_spec }, "%]" ;
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expr                 = [ "@" ], "0" .. "9" | "DNAME" | "FNAME" | "ITEM" | PARAMETER ;
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sexpr_spec           = sexpr_op_unary, SH_SUBSTRING_PATTERN, { sexpr } ;
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sexpr_op_unary       = "##" | "#" | "%%" | "%" ;
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```
Lucio Andrés Illanes Albornoz 531158
  
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Single ``"="`` characters in ``spec``, the ``"%<"`` and ``"%["`` character
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sequences in ``pattern_spec`` and ``expr_spec``, resp., and the ``sexpr_op_unary``
Lucio Andrés Illanes Albornoz 531158
as well as ``sexpr_op_binary`` characters or character sequences may be
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escaped with a single backslash (``"\"``.) ``SH_SUBSTRING_PATTERN`` differs
Lucio Andrés Illanes Albornoz 531158
from ``SH_GLOB_PATTERN`` solely in that any of ``sexpr_op_unary`` and
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``sexpr_op_binary`` occuring at the beginning of or in the former must
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be escaped with a single backslash (``"\"``,) e.g. ``"#\#pattern"`` and
Lucio Andrés Illanes Albornoz 531158
``"%\%pattern"``, etc. and ``"#pat\%ern"`` and ``%patt\#ern", etc., resp.  
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
Named parameters (``PARAMETER``) are supplied via the ``-p name=value``
Lucio Andrés Illanes Albornoz 531158
argument to ``rtl_install()``, whereas numbered parameters are for
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internal usage only; the ``"DNAME"``, ``"FNAME"``, and ``"ITEM"`` parameters
Lucio Andrés Illanes Albornoz 531158
lazily evaluate to the directory name, file (aka base) name, and full
Lucio Andrés Illanes Albornoz 531158
pathname of the current item being processed relative to a specification
Lucio Andrés Illanes Albornoz 531158
with a pattern in it.
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The following parameters are defined by default during ``install_files``:
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| Name           | Value                                  |
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| -------------  | -------------------------------------- |
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| _builddir      | ${PKG_BUILD_DIR}                       |
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| _destdir       | ${PKG_BASE_DIR}/${PKG_DESTDIR}         |
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| _destdir_host  | ${PKG_BASE_DIR}/${PKG_DESTDIR_HOST}    |
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| _files         | ${MIDIPIX_BUILD_PWD}/files/${PKG_NAME} |
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| _name          | ${PKG_NAME}                            |
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| _prefix        | ${PKG_PREFIX}                          |
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| _prefix_host   | ${PREFIX}                              |
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| _prefix_native | ${PREFIX_NATIVE}                       |
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| _subdir        | ${PKG_BASE_DIR}/${PKG_SUBDIR}          |
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| _target        | ${PKG_TARGET}                          |
Lucio Andrés Illanes Albornoz 531158
| _version       | ${PKG_VERSION:-}                       |
Lucio Andrés Illanes Albornoz 531158
| _workdir       | ${BUILD_WORKDIR}                       |
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The following operation flags are defined:
Lucio Andrés Illanes Albornoz 531158
| Flag      | Description              |
Lucio Andrés Illanes Albornoz 531158
| --------- | ------------------------ |
Lucio Andrés Illanes Albornoz 531158
| ``?``     | Continue on soft failure |
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The following operations are defined:
Lucio Andrés Illanes Albornoz 531158
| Operation      | Arity  | Description                                                      |
Lucio Andrés Illanes Albornoz 531158
| -------------- | ------ | ---------------------------------------------------------------- |
Lucio Andrés Illanes Albornoz 531158
| ``-``          | Unary  | Remove directories and/or files                                  |
Lucio Andrés Illanes Albornoz 531158
| ``/``          | Unary  | Create directories or trees thereof                              |
Lucio Andrés Illanes Albornoz 531158
| ``t``          | Unary  | touch(1) files and/or directories                                |
Lucio Andrés Illanes Albornoz 95707c
| ``:``          | Binary | Copy directories and/or files                                    |
Lucio Andrés Illanes Albornoz 531158
| ``!``          | Binary | Move/rename directories and/or files                             |
Lucio Andrés Illanes Albornoz 531158
| ``@``          | Binary | Create/update symbolic links                                     |
Lucio Andrés Illanes Albornoz 531158
| ``+``          | Binary | Copy directories and/or files if newer and follow symbolic links |
Lucio Andrés Illanes Albornoz 531158
| ``g``          | Binary | Set group owner of files and/or directories                      |
Lucio Andrés Illanes Albornoz 531158
| ``m``          | Binary | Set mode bits of files and/or directories                        |
Lucio Andrés Illanes Albornoz 531158
| ``o``          | Binary | Set user and/or group owner of files and/or directories          |
Lucio Andrés Illanes Albornoz 531158
| ``T``          | Binary | touch(1) files and/or directories with timestamp                 |
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The following expression modifiers are defined:
Lucio Andrés Illanes Albornoz 531158
| Modifier       | Description                               |
Lucio Andrés Illanes Albornoz 531158
| -------------- | ----------------------------------------- |
Lucio Andrés Illanes Albornoz 531158
| ``@``          | Recursively reevaluate after substituting |
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The following subexpression operators are defined:
Lucio Andrés Illanes Albornoz 531158
| Operation      | Arity  | Description                                                      |
Lucio Andrés Illanes Albornoz 531158
| -------------- | ------ | ---------------------------------------------------------------- |
Lucio Andrés Illanes Albornoz 531158
| ``##``         | Unary  | Remove largest prefix from left-hand side                        |
Lucio Andrés Illanes Albornoz 531158
| ``#``          | Unary  | Remove prefix from left-hand side                                |
Lucio Andrés Illanes Albornoz 531158
| ``%%``         | Unary  | Remove largest postfix from right-hand side                      |
Lucio Andrés Illanes Albornoz 531158
| ``%``          | Unary  | Remove postfix from right-hand side                              |
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
```shell
Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Examples:
Lucio Andrés Illanes Albornoz 531158
# 
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Create directory %[_minipix]/bin and copy all files
Lucio Andrés Illanes Albornoz 531158
# in %[_minipix_dist]/bin/ to %[_minipix]/bin/ with
Lucio Andrés Illanes Albornoz 531158
# identical file names.
Lucio Andrés Illanes Albornoz 531158
/=%[_minipix]/bin
Lucio Andrés Illanes Albornoz 531158
?%[_minipix_dist]/bin/%<*>=%[_minipix]/bin/%[FNAME]
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Rename all files in share/info/ matching *.info to
Lucio Andrés Illanes Albornoz 531158
# their filenames with the `.info' postfix removed and
Lucio Andrés Illanes Albornoz 531158
# `-2.64.info' appended and all files in share/man/man1/
Lucio Andrés Illanes Albornoz 531158
# matching *.1 with the `.1' postfix removed and -2.64.1
Lucio Andrés Illanes Albornoz 531158
# appended.
Lucio Andrés Illanes Albornoz 531158
!share/info/%<*.info>=share/info/%[FNAME%.info]-2.64.info
Lucio Andrés Illanes Albornoz 531158
!share/man/man1/%<*.1>=share/man/man1/%[FNAME%.1]-2.64.1
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Create/update symbolic links named include/ffi.h and
Lucio Andrés Illanes Albornoz 531158
# include/ffitarget.h with ../lib/libffi-3.2.1/include/ffi.h
Lucio Andrés Illanes Albornoz 531158
# and ../lib/libffi-3.2.1/include/ffitarget.h as targets, resp.
Lucio Andrés Illanes Albornoz 531158
@../lib/libffi-3.2.1/include/ffi.h=include/ffi.h
Lucio Andrés Illanes Albornoz 531158
@../lib/libffi-3.2.1/include/ffitarget.h=include/ffitarget.h
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Manual invocation:
Lucio Andrés Illanes Albornoz 531158
PKG_INSTALL_FILES="
Lucio Andrés Illanes Albornoz 531158
        [ ... ]
Lucio Andrés Illanes Albornoz 531158
";
Lucio Andrés Illanes Albornoz 531158
rtl_install                                                     \
Lucio Andrés Illanes Albornoz 531158
                -p "_builddir=${PKG_BASE_DIR}/${PKG_BUILD_DIR}" \
Lucio Andrés Illanes Albornoz 531158
                -p "_minipix=${PREFIX_MINIPIX##*/}"             \
Lucio Andrés Illanes Albornoz 531158
                -p "_minipix_dist=${PREFIX}/minipix_dist"       \
Lucio Andrés Illanes Albornoz 531158
                -p "_native=${PREFIX_NATIVE##*/}"               \
Lucio Andrés Illanes Albornoz 531158
                -p "_subdir=${PKG_BASE_DIR}/${PKG_SUBDIR}"      \
Lucio Andrés Illanes Albornoz 531158
                -p "_target=${PKG_TARGET}"                      \
Lucio Andrés Illanes Albornoz 531158
                -n -- "${PREFIX}"                               \
Lucio Andrés Illanes Albornoz 531158
                "${PKG_INSTALL_FILES}"; then
Lucio Andrés Illanes Albornoz 531158
        return 1;
Lucio Andrés Illanes Albornoz 531158
fi;
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
#
Lucio Andrés Illanes Albornoz 531158
# Usage screen:
Lucio Andrés Illanes Albornoz 531158
usage: rtl_install [-i] [-I ifs] [-n] [-p name=val] [-v] prefix spec_list
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       -i...........: continue on soft errors
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       -I ifs.......: process spec_list with ifs instead of NL
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       -n...........: perform dry run
Lucio Andrés Illanes Albornoz 531158
       -p name=val..: set named parameter
Lucio Andrés Illanes Albornoz 531158
       -v...........: increase verbosity
Lucio Andrés Illanes Albornoz 531158
       prefix.......: pathname prefix
Lucio Andrés Illanes Albornoz 531158
       spec_list....: ifs-separated list of specs
Lucio Andrés Illanes Albornoz 531158
```
Lucio Andrés Illanes Albornoz 531158
  
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[Back to top](#table-of-contents)
Lucio Andrés Illanes Albornoz 531158

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[//]: # "}}}"
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[//]: # "{{{ 4.5. Package variables"
Lucio Andrés Illanes Albornoz 531158
### 4.5. Package variables
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
The following variables are package-specific and receive their value from either
Lucio Andrés Illanes Albornoz 531158
top-level defaults defined in ``midipix.env``, build group-specific defaults from the
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build group the package pertains to and defined in its corresponding file beneath
Lucio Andrés Illanes Albornoz 531158
``groups/``, or package-specific overrides defined either in the latter and/or in its
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corresponding file beneath ``vars/``, with one of the following prefixes:
Lucio Andrés Illanes Albornoz 531158

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| Variable name prefix					|
Lucio Andrés Illanes Albornoz 531158
| ----------------------------------------------------- |
Lucio Andrés Illanes Albornoz 531158
| DEFAULT						|
Lucio Andrés Illanes Albornoz 531158
| DEFAULT_``${BUILD_TYPE}``				|
Lucio Andrés Illanes Albornoz 531158
| DEFAULT_``${GROUP_NAME}``				|
Lucio Andrés Illanes Albornoz 531158
| ``${GROUP_NAME}``					|
Lucio Andrés Illanes Albornoz 531158
| [PKG_``${RELATED_PACKAGE(S)}``]			|
Lucio Andrés Illanes Albornoz 531158
| [PKG_``${RELATED_PACKAGE(S)}``_``${BUILD_KIND}``]	|
Lucio Andrés Illanes Albornoz 531158
| PKG_``${NAME}``					|
Lucio Andrés Illanes Albornoz 531158
| PKG_``${NAME}``_``${BUILD_KIND}``			|
Lucio Andrés Illanes Albornoz 531158

Lucio Andrés Illanes Albornoz 531158
Additionally, overrides may be specified on a per-build basis on the command-
Lucio Andrés Illanes Albornoz 531158
line, with each variable prefixed w/ ``PKG_``, e.g.:
Lucio Andrés Illanes Albornoz 531158
``./build.sh [ ... ] PKG_ZSH_CC="/usr/bin/clang"``.  
Lucio Andrés Illanes Albornoz 531158
  
Lucio Andrés Illanes Albornoz 531158
The minimum set of package variables that must be provided is ``SHA256SUM, URL,
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VERSION`` and/or ``URLS_GIT``, respectively.
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[//]: # "{{{ 4.5.1 Package variable types"
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## 4.5.1 Package variable types
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| Type definition               | Description                                                                                                                                  |
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| ----------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------- |
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| DirName(Abs)			| Absolute pathname to directory                                                                                                               |
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| DirName(Rel)			| Relative pathname to director                                                                                                                |
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| DirName(Unit)			| Single non-{absolute,relative} directory nam                                                                                                 |
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| DirName			| Absolute or relative pathname to director                                                                                                    |
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| CmdName			| Absolute or relative pathname to comman                                                                                                      |
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| FileName(Abs)			| Absolute pathname to file                                                                                                                    |
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| FileName(Rel)			| Relative pathname to file                                                                                                                    |
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| FileName(Unit)		| Single non-{absolute,relative} file name                                                                                                     |
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| FileName			| Absolute or relative pathname to file                                                                                                        |
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| Flag(<type>,<default>)	| Boolean flag of type <type>, e.g. Flag(Boolean) (``true``, ``false``,) Flag(UInt) (0, 1,) Flag(ExitStatus) (>=1, 0) with default or ``auto`` |
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| FlagLine			| String of {SP,VT}-separated flags, arguments, options, etc. pp. to a command                                                                 |
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| List(<sep>[,<sep|type>..])	| <sep>-separated list, optionally recursively and/or sub-typing, e.g.: ``List(:,=,String)`` and ``"name=value:name2=va lue "``                |
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| PkgName			| Single name of package                                                                                                                       |
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| PkgRelation			| Single, possibly parametrised, package-package relation; see section [3.6](#36-package-package-and-packagegroup-group-relationships)         |
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| PkgVersion			| Single version of package                                                                                                                    |
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| Set(<type>)			| Set of alternatives of <type>, e.g. one of ``cross``, ``host``, ``native``                                                                   |
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| String			| Semantically generic string                                                                                                                  |
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| URL				| URL in standard format; see section [3.4](#34-package-archive-files-and-git-repositories)                                                    |
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| URL(Git)			| Git URL in the format ``[subdir=]URL[@branch]``; see section [3.4](#34-package-archive-files-and-git-repositories)                           |
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[//]: # "}}}"
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[//]: # "{{{ 4.5.2 Package variables"
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## 4.5.2 Package variables
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| Package variable name        | Type             | Description                                                                                                                                |
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| ---------------------------- | ---------------- | ------------------------------------------------------------------------------------------------------------------------------------------ |
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| AR                           | CmdName          | Toolchain library archive editor ``ar(1)``                                                                                                 |
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| AUTOCONF_CONFIG_GUESS        | String           | Either of ``midipix`` (copy Midipix ``config.guess`` from ``etc/config.guess``) or ``keep``; defaults to ``midipix``                       |
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| BASE_DIR                     | DirName(Abs)     | Package build root directory beneath ``${BUILD_WORKDIR}``                                                                                  |
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| BUILD_DIR                    | DirName(Unit)    | Package build directory beneath ``${PKG_BASE_DIR}``                                                                                        |
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| BUILD_STAGES_DISABLE         | List( )          | Build stages to disable during package build                                                                                               |
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| BUILD_TYPE                   | Set(String)      | ``cross``: Cross-compiled toolchain, ``host``: host, ``native``: cross-compiled package                                                    |
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| CC                           | FileName         | Toolchain C compiler ``cc(1)``                                                                                                             |
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| CFLAGS_BUILD_EXTRA           | FlagLine         | Additional C compiler flags during package ``make(1)`` build                                                                               |
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| CFLAGS_BUILD                 | FlagLine         | C compiler flags during package ``make(1)``  build                                                                                         |
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| CFLAGS_CONFIGURE_EXTRA       | FlagLine         | Additional C compiler flags during package (GNU autotools in implementation and/or interface) configuration                                |
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| CFLAGS_CONFIGURE             | FlagLine         | C compiler flags during package (GNU autotools in implementation and/or interface) configuration                                           |
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| CMAKE_ARGS_EXTRA             | FlagLine         | Additional arguments to ``cmake(1)``                                                                                                       |
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| CMAKE_ARGS                   | FlagLine         | Arguments to ``cmake(1)``                                                                                                                  |
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| CMAKE                        | CmdName          | ``cmake(1)`` executable                                                                                                                    |
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| CMAKE_LISTFILE               | FileName         | ``cmake(1)`` listfile                                                                                                                      |
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| CONFIG_CACHE_EXTRA           | List(\n)         | Additional GNU autotools configuration cache variables                                                                                     |
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| CONFIG_CACHE                 | List(\n)         | GNU autotools configuration cache variables                                                                                                |
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| CONFIG_CACHE_LOCAL           | List(\n)         | Additional GNU autotools configuration cache variables                                                                                     |
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| CONFIGURE_ARGS_EXTRA         | FlagLine         | Additional arguments to package (GNU autotools in implementation and/or interface) configuration script                                    |
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| CONFIGURE_ARGS               | FlagLine         | Arguments to package (GNU autotools in implementation and/or interface) configuration script                                               |
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| CONFIGURE                    | CmdName          | Package's (GNU autotools in implementation and/or interface) configuration script                                                          |
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| CONFIGURE_TYPE               | String           | Either of ``autotools`` (GNU autotools or similar) or ``sofort`` or ``cmake`` (CMake)                                                      |
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| CXX                          | CmdName          | Toolchain C++ compiler ``c++(1)``                                                                                                          |
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| CXXFLAGS_CONFIGURE_EXTRA     | FlagLine         | Additional C++ compiler flags during package (GNU autotools in implementation and/or interface) configuration                              |
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| CXXFLAGS_CONFIGURE           | FlagLine         | C++ compiler flags during package (GNU autotools in implementation and/or interface) configuration                                         |
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| DEPENDS                      | List( )          | Mandatory package-package dependencies                                                                                                     |
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| DESTDIR                      | DirName(Unit)    | Package installation destination directory beneath ``${PKG_BASE_DIR}``                                                                     |
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| DESTDIR_HOST                 | DirName(Unit)    | Optional host package installation destination directory beneath ``${PKG_BASE_DIR}``                                                       |
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| DISABLED                     | Flag(UInt,0)     | Disable package                                                                                                                            |
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| ENV_VARS_EXTRA               | List(:,=)        | Name-value pairs of environment variables to set during package build                                                                      |
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| FNAME                        | FileName(Unit)   | Filename of package archive file                                                                                                           |
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| FORCE_AUTORECONF             | Flag(UInt,0)     | Forcibly run ``autoreconf -fiv`` prior to package (GNU autotools in implementation and/or interface) configuration                         |
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| GITROOT                      | URL              | midipix packages Git URL prefix                                                                                                            |
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| INHERIT_FROM                 | String           | Inherit variables from named package                                                                                                       |
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| INSTALL_FILES_DESTDIR_EXTRA  | List( )          | Additional files to initialise the package installation destination directory beneath ``${PKG_BASE_DIR}`` with                             |
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| INSTALL_FILES_DESTDIR        | List( )          | Files to initialise the package installation destination directory beneath ``${PKG_BASE_DIR}`` with                                        |
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| INSTALL_FILES                | List( )          | Files to manually install into the package installation destination directory beneath ``${PKG_BASE_DIR}``                                  |
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| INSTALL_TARGET_EXTRA         | String           | Additional name of package build ``make(1)`` installation target                                                                           |
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| INSTALL_TARGET               | String           | Name of package build ``make(1)`` installation target                                                                                      |
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| IN_TREE                      | Flag(UInt,auto)  | Build package in-tree within ``${PKG_SUBDIR}``                                                                                             |
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| LDFLAGS_BUILD_EXTRA          | FlagLine         | Additional linker flags during package ``make(1)``  build                                                                                  |
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| LDFLAGS_CONFIGURE_EXTRA      | FlagLine         | Additional linker flags during package (GNU autotools in implementation and/or interface) configuration                                    |
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| LDFLAGS_CONFIGURE            | FlagLine         | Linker flags during package (GNU autotools in implementation and/or interface) configuration                                               |
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| LIBTOOL                      | CmdName          | ``libtool(1)`` implementation (defaults to ``slibtool``)                                                                                   |
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| MAKE                         | CmdLine          | Command line of ``make(1)``                                                                                                                |
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| MAKEFLAGS_BUILD_EXTRA        | FlagLine         | Additional ``make(1)`` flags during package ``make(1)``  build                                                                             |
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| MAKEFLAGS_BUILD              | FlagLine         | ``make(1)`` flags during package ``make(1)``  build                                                                                        |
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| MAKEFLAGS_INSTALL_EXTRA      | FlagLine         | ``make(1)`` flags during package ``make(1)``  installation                                                                                 |
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| MAKEFLAGS_INSTALL            | FlagLine         | ``make(1)`` flags during package ``make(1)``  installation                                                                                 |
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| MAKEFLAGS_VERBOSITY          | String           | Variable-value pair to pass to ``make(1)`` in order to force echo-back of command lines prior to execution                                 |
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| MAKE_INSTALL_VNAME           | String           | Variable name of ``make(1)`` installation destination directory variable during package ``make(1)``  installation                          |
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| MAKE_SUBDIRS                 | List( )          | ``make(1)`` subdirectories to exclusively build                                                                                            |
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| MIRRORS_GIT                  | List( )          | Package Git repository mirror base URLs to attempt cloning from; cf. ``pkgtool.sh -m <dname>``                                             |
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| MIRRORS                      | List( )          | Package archive mirror base URLs to attempt downloading from; cf. ``pkgtool.sh -m <dname>``                                                |
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| NO_CLEAN_BASE_DIR            | Flag(UInt,0)     | Inhibit cleaning of package build root directory beneath ``${BUILD_WORKDIR}``                                                              |
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| NO_CLEAN                     | Flag(UInt,0)     | Inhibit cleaning of package build directory beneath ``${PKG_BASE_DIR}`` pre-finish                                                         |
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| NO_LOG_VARS                  | Flag(UInt,0)     | Inhibit logging of build & package variables pre-package build                                                                             |
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| PATCHES_EXTRA                | List( )          | Additional patches to apply                                                                                                                |
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| PKG_CONFIG                   | CmdName          | ``pkg-config(1)`` implementation                                                                                                           |
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| PKG_CONFIG_LIBDIR            | DirName          | ``pkg-config(1)`` search directory                                                                                                         |
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| PKGLIST_DISABLE              | Flag(UInt,0)     | Inhibit inclusion into ``${PREFIX}/pkglist.${PKG_BUILD_TYPE}``                                                                             |
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| PREFIX                       | DirName(Abs)     | Top-level installation directory and package search path                                                                                   |
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| PYTHON                       | CmdName          | Python >=3.x interpreter                                                                                                                   |
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| RANLIB                       | CmdName          | Toolchain library archive index generator ``ranlib(1)``                                                                                    |
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| RELATES                      | Set(PkgRelation) | Package-package relationships                                                                                                              |
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| RPM_DISABLE                  | Flag(UInt,0)     | Inhibit creation of RPM archive                                                                                                            |
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| SHA256SUM                    | String           | SHA-256 message digest of package archive                                                                                                  |
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| SOFORT_NATIVE_CC             | FileName         | ``sofort`` variable during ``native`` build: Toolchain C compiler ``cc(1)``                                                                |
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| SOFORT_NATIVE_CFLAGS_EXTRA   | FlagLine         | ``sofort`` variable during ``native`` build: Additional C compiler flags during package (GNU autotools or similar) configuration           |
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| SOFORT_NATIVE_CFLAGS         | FlagLine         | ``sofort`` variable during ``native`` build: C compiler flags during package (GNU autotools or similar) configuration                      |
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| SOFORT_NATIVE_CXXFLAGS_EXTRA | FlagLine         | ``sofort`` variable during ``native`` build: Additional list of C++ compiler flags during package (GNU autotools or similar) configuration |
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| SOFORT_NATIVE_CXXFLAGS       | FlagLine         | ``sofort`` variable during ``native`` build: List of C++ compiler flags during package (GNU autotools or similar) configuration            |
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| SOFORT_NATIVE_CXX            | FlagLine         | ``sofort`` variable during ``native`` build: Command- or pathname of toolchain C++ compiler ``c++(1)``                                     |
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| SOFORT_NATIVE_LDFLAGS_EXTRA  | FlagLine         | ``sofort`` variable during ``native`` build: Additional linker flags during package (GNU autotools or similar) configuration               |
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| SOFORT_NATIVE_LDFLAGS        | FlagLine         | ``sofort`` variable during ``native`` build: Linker flags during package (GNU autotools or similar) configuration                          |
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| SOFORT_NATIVE_LD             | FileName         | ``sofort`` variable during ``native`` build: Command- or pathname of toolchain C compiler ``cc(1)``                                        |
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| SUBDIR                       | DirName(Rel)     | Extracted archive or git-{clone,pull}(1)'d directory                                                                                       |
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| TARGET                       | String           | Dash-separated {build,host,target} triplet                                                                                                 |
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| URL                          | List( ,URL)      | URL to package archives w/ optional alternatives; see section [3.4](#34-package-archive-files-and-git-repositories)                        |
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| URLS_GIT                     | List( ,URL(Git)) | Package Git URL(s) (format: ``[subdir=]URL[@branch]``, see section [3.4](#34-package-archive-files-and-git-repositories))                  |
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| VARS_FILE                    | FileName         | Optional package variables file (defaults to ``vars/${PKG_NAME}.vars``)                                                                    |
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| VERSION                      | PkgVersion       | Package version                                                                                                                            |
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[//]: # "}}}"
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 4.6. ``pkgtool.sh``"
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## 4.6. ``pkgtool.sh``
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```
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usage: ./pkgtool.sh [-a nt32|nt64] [-b debug|release] [-i|-m <dname> -M <dname>|-r|-s|-t] [-v]
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                    [<variable name>=<variable override>[ ..]] name
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        -a nt32|nt64          Selects 32-bit or 64-bit architecture; defaults to nt64.
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        -b debug|release      Selects debug or release build kind; defaults to debug.
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        -i                    List package variables and dependencies of single named package.
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        -m <dname>            Setup package archives mirror in <dname> and/or
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        -M <dname>            Setup Git repositories mirror in <dname>
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        -r                    List reverse dependencies of single named package.
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        -s                    Enter interactive package build shell environment for single
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                              named package; requires a package dump file. If the package
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                              has not been built yet or built successfully, it will be rebuilt
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                              at build steps up until, by default, the `build' build step and
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                              forcibly aborted and dumped prior to enterting the shell.
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        -t                    Produce tarball of package build root directory and build log
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                              file for the purpose of distribution given build failure.
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        -v                    Increase verbosity.
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        <variable name>=<variable override>[ ..]
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                              Override build variable.
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```
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> N.B. When using ``pkgtool.sh`` on a build w/ build variables (see section [4.2](#42-build-variables))
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overriden on the command line or via the environment, ensure that they are included in the
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``pkgtool.sh`` command line, preceding the package name, or exported, respectively.
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[//]: # "{{{ 5. References"
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## 5. References
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* ``Sun, 25 Apr 2016 09:04:08 +0000 [1]`` musl FAQ  
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* ``Wed, 04 Mar 2020 13:36:19 +0000 [2]`` midipix - what is midipix, and how is it different?  
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* ``Wed, 29 Apr 2020 23:33:34 +0100 [3]`` User Rights Assignment (Windows 10) - Windows security | Microsoft Docs  
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* ``Wed, 29 Apr 2020 23:33:50 +0100 [4]`` Windows Vista Application Development Requirements for User Account Control Compatibility | Microsoft Docs  
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[Back to top](#table-of-contents)
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[//]: # "}}}"
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[modeline]: # ( vim: set ff=dos tw=0: )