Build of optipng with musl toolchain

The build took 00h 01m 06s and was NOT successful.

The program in this build is written in the following languages, according to sloccount:

SLOCLanguage
80,434 ansic
5,982 sh
3,276 asm
1,681 ada
1,131 pascal
1,001 cpp
879 cs
782 awk
406 makefile
104 perl
95,676 total

The process tree of the build process is here.

List of Errors

Log

To avoid scrolling, you may jump to the last line of the invocation of makepkg that was used to build this package.

Removed vanilla repositories from pacman.conf and added:
# [tuscan]
# Server = file:///var/cache/pacman/pkg/

CMD: pacman -Syy --noconfirm
# :: Synchronizing package databases...
# downloading tuscan.db...

There were existing files in /sysroot, using those
# /sysroot/lib
# /sysroot/share
# /sysroot/bin
# /sysroot/include
# /sysroot/libexec

CMD: sudo -u tuscan PATH=/sysroot/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin CC=clang CXX=clang++ red makepkg --noextract --syncdeps --skipinteg --skippgpcheck --skipchecksums --noconfirm --nocolor --log --noprogressbar --nocheck
# ==> Making package: optipng 0.7.6-1 (Tue Apr 4 23:49:27 UTC 2017)
# ==> Checking runtime dependencies...
# ==> Checking buildtime dependencies...
# ==> WARNING: Using existing $srcdir/ tree
# ==> Starting build()...
# ./configure: error: unknown option: --host=x86_64-unknown-linux
# Type "./configure -help" for help
# ==> ERROR: A failure occurred in build().
# Aborting...