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Obtaining and installing a Midipix distribution
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===============================================
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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] 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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Compressed Midipix distribution tarballs and, separately, source tarballs are,
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at present, produced every four (4) hours UTC after each successful build and
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subsequently signed. This process is fully automated by a portable Bourne shell
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script; all of the above mentioned components are cross-compiled.
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Thus, the most hassle-free way to get started with Midipix is to simply download
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the most recent distribution tarball and follow the instructions below. It is,
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however, recommended to anyone intending to use Midipix as a development platform
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to familiarise themselves with the build process. Other reasons to prefer building
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a Midipix distribution yourself include integrating new 3rd party software or local
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runtime component patches. At present, a full build from scratch takes about 30
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(thirty) minutes to finish on an 8-core host with eight simultaneous make jobs,
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minus the generation of the tarballs. The build script can be obtained from the
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following GitHub repository: <https://github.com/lalbornoz/midipix_build>.
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If you obtained a Midipix distribution tarball, extract it into a directory and
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drive of your choice, henceforth referred to as target directory; the drive can
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be a network drive. Do _not_ use anything but a true UNIX environment tar(1), as
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e.g. WinRAR or WinZip handle extracting hard links incorrectly.
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If you built Midipix yourself, the target directory is equivalent to the ${PREFIX}
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configured in build.vars, which defaults to ${HOME}/midipix.
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At present, providing an interactive Midipix environment still requires the Cygwin
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terminal emulator Mintty and a shell; this does not include pseudoterminals, which
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are entirely handled by Midipix. Both can be installed via the 64-bit Cygwin setup
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program at <https://www.cygwin.com/setup-x86_64.exe>.
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Once installed, launching a Midipix shell is accomplished by the `midipix.sh' shell
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script provided in the target directory from within a Cygwin shell prompt in Mintty
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and the target directory. This may either simply be done manually each time, or
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automated by a shortcut. As shortcuts cannot be distributed, it can be created by
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either:
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* Opening (executing) the VBScript script in the target directory from within the
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  latter cscript.exe, providing the fully qualified pathname to Mintty, if it differs
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  from the default value of C:\cygwin64\bin\mintty.exe or
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* manually creating a shortcut to Mintty with `Start in:' set to the target directory
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  and the following command line:
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  [ ... ]\mintty.exe -i /Cygwin-Terminal.ico -e sh midipix.sh, or
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References:
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* Sun, 24 Apr 2016 09:04:08 +0000 [1] musl FAQ <http://www.musl-libc.org/faq.html>
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Linux distribution-related errata
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=================================
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Busybox based distributions need the gawk, gsed, and coreutils packages to build perl.