usage: ./build.sh [-c] [-nd] [-r ALL|name[:step]] [-h] [-t]

        -c                     Clean $PREFIX before processing build scripts.

        -nd                    Don't rm(1) and re-download tarballs when not required.

        -r ALL|name[:step]     Restart all or the specified build script(s) completely

                               or at the optionally specified build step. Currently defined

                               build steps are: fetch extract patch configure clean build

                               install configure1 configure2 build1 build2 install1 install2.

        -h                     Show this screen.

        -t                     Produce a distribution tarball containing $PREFIX

                               sans $WORKDIR and $PREFIX/src/midipix_build at the end of a

                               build with zero failures.

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

        -X                     Set the xtrace sh(1)ell option and compile a tarball containing

                               build.log and $PKG_SUBDIR. Use this option if something goes

                               wrong and provide an URL to the tarball in <irc://irc.freenode.net/midipix>.

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

        named ${PKG_SUBDIR}.local.patch.

        Examples:

        ./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.