Package: src:gcc-7 Version: 7.1.0-2 Severity: important seen on the Hurd as well.
https://buildd.debian.org/status/fetch.php?pkg=gcc-7&arch=kfreebsd-amd64&ver=7.1.0-2&stamp=1493749029&raw=0https://buildd.debian.org/status/fetch.php?pkg=gcc-7&arch=kfreebsd-amd64&ver=7.1.0-2&stamp=1493749029&raw=0 make[8]: Entering directory '/«PKGBUILDDIR»/build/gcc/ada/rts' /«PKGBUILDDIR»/build/./gcc/xgcc -B/«PKGBUILDDIR»/build/./gcc/ -B/usr/x86_64-kfreebsd-gnu/bin/ -B/usr/x86_64-kfreebsd-gnu/lib/ -isystem /usr/x86_64-kfreebsd-gnu/include -isystem /usr/x86_64-kfreebsd-gnu/sys-include -isystem /«PKGBUILDDIR»/build/sys-include -c -g -O2 -W -Wall -gnatpg -nostdinc a-assert.adb -o a-assert.o depbase=`echo math/sincosq.lo | sed 's|[^/]*$|.deps/&|;s|\.lo$||'`;\ /bin/bash ./libtool --tag=CC --mode=compile /«PKGBUILDDIR»/build/./gcc/xgcc -B/«PKGBUILDDIR»/build/./gcc/ -B/usr/x86_64-kfreebsd-gnu/bin/ -B/usr/x86_64-kfreebsd-gnu/lib/ -isystem /usr/x86_64-kfreebsd-gnu/include -isystem /usr/x86_64-kfreebsd-gnu/sys-include -isystem /«PKGBUILDDIR»/build/sys-include -DHAVE_CONFIG_H -I. -I../../../../src/libquadmath -I ../../../../src/libquadmath/../include -g -O2 -m32 -MT math/sincosq.lo -MD -MP -MF $depbase.Tpo -c -o math/sincosq.lo ../../../../src/libquadmath/math/sincosq.c &&\ mv -f $depbase.Tpo $depbase.Plo fatal error, run-time library not installed correctly cannot locate file system.ads compilation abandoned ../gcc-interface/Makefile:308: recipe for target 'a-assert.o' failed make[8]: *** [a-assert.o] Error 1