https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103560
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to brocolis from comment #1) > make[2]: Entering directory > '/build/mingw/build-gcc-git/x86_64-w64-mingw32/libgfortran' > /bin/sh ../../../gcc-git/libgfortran/mk-kinds-h.sh '1 2 4 8 16' '4 8 10 16' > '/build/mingw/build-gcc-git/./gcc/gfortran > -B/build/mingw/build-gcc-git/./gcc/ > -L/build/mingw/dest-x86_64/x86_64-w64-mingw32/lib > -L/build/mingw/dest-x86_64/mingw/lib -isystem > /build/mingw/dest-x86_64/x86_64-w64-mingw32/include -isystem > /build/mingw/dest-x86_64/mingw/include > -B/build/mingw/dest-x86_64/x86_64-w64-mingw32/bin/ > -B/build/mingw/dest-x86_64/x86_64-w64-mingw32/lib/ -isystem > /build/mingw/dest-x86_64/x86_64-w64-mingw32/include -isystem > /build/mingw/dest-x86_64/x86_64-w64-mingw32/sys-include -I . -Wall > -Werror -fimplicit-none -fno-repack-arrays -fno-underscoring -g -O2' > > kinds.h || rm kinds.h > f951.exe: Error: Nonexistent include directory './' > [-Werror=missing-include-dirs] > f951.exe: all warnings being treated as errors Oh wait that is the issue.