usage: ./build.sh [-x] [-4|6] [-a nt32|nt64] [-b debug|release] [-c] [-C] [-h]

                  [-i] [-N] [-r package[,...][:step]] [-R] [-t[.gz|.bz2|.xz] [-v]

                  [<target>[ ...]]

        -x                      Set the xtrace sh(1)ell option for debugging purposes.

        -4|-6                   Force IPv[46] when downloading files.

        -a nt32|nt64            Selects 32-bit or 64-bit architecture; defaults to nt64.

        -b debug|release        Selects debug or release build; defaults to debug.

        -c                      Clean ${PREFIX} before processing build scripts.

        -C                      Check package(s) for updates upstream.

        -h                      Show this screen.

        -i                      Ignore SHA256 hash mismatches when downloading files.

        -N                      Offline mode: no {wget,git-{clone,pull}}(1) calls.

        -r package[,...][:step] Restart the specified comma-separated build(s) completely or at

                                the optionally specified step. Currently defined steps are:

                                fetch extract build_dir patch_pre autoconf patch configure clean

                                build install.

        -R                      Ignore build failures and continue building (relaxed mode.)

        -t[.gz|.bz2|.xz]        Produce binary distribution and source tarballs containing ${PREFIX}

                                sans ${WORKDIR} and ${PREFIX}/src/midipix_build and ${WORKDIR} sans top-

                                level regular files at the end of a build with zero failures. The

                                tarballs will be compressed with either gzip, bzip2, or xz and signed

                                with GPG; the default compression is xz.

        -v                      Be verbose.

        --debug-minipix         Don't strip(1) minipix binaries to facilitate debugging minipix.

        <target>[ ...]          One of:

                                host_toolchain, native_toolchain, runtime, lib_packages,

                                leaf_packages, minipix, world, or devroot.

        ${HOME}/midipix_build.vars, ../midipix_build.vars, and build.vars are sourced

        if they exist.

        Packages that are built by pkg.build will apply local patches in ${WORKDIR}

        named ${PKG_SUBDIR}.local.patch.

        Examples:

        ./build.sh -r coreutils

        Completely restart the coreutils build.

        ./build.sh -r coreutils:configure,build,install

        Restart the configure, build, and install steps of the coreutils build.

        ./build.sh -r psxscl GITROOT_HEAD=... PKG_PSXSCL_CFLAGS_CONFIGURE_EXTRA=-DPSX_INTERNAL_STRACE

        Build psxscl from the internal repository with strace enabled.

        ./build.sh -c -r ALL GITROOT_HEAD=...

        Clean ${PREFIX} and forcibly rebuild everything.

This script has been tested on the following platforms:

Alpine v3.4 (20160917_17:50) (x86_64)

Arch Linux 2016.02.01 (x86_64)

CentOS v7.2.1511 (Core) (x86_64)

Debian GNU/Linux v8.5 (stable) (jessie) (x86_64)

Exherbo Linux (x86_64-pc-linux-musl) (x86_64)

openSUSE 20150612 (Tumbleweed) (x86_64)