system/gcc: FTBFS: libgo.so: undefined reference to `*64'
Found on x86_64:
...
/usr/src/packages/system/gcc/src/build/./gcc/gccgo -B/usr/src/packages/system/gcc/src/build/./gcc/ -B/usr/x86_64-foxkit-linux-musl/bin/ -B/usr/x86_64-foxkit-linux-musl/lib/ -isystem /usr/x86_64-foxkit-linux-musl/include -isystem /usr/x86_64-foxkit-linux-musl/sys-include -g -O2 -fno-omit-frame-pointer -ggdb -march=nocona -mtune=core2 -mfpmath=sse -I ../x86_64-foxkit-linux-musl/libgo -static-libstdc++ -static-libgcc -L ../x86_64-foxkit-linux-musl/libgo -L ../x86_64-foxkit-linux-musl/libgo/.libs -o cgo /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/ast.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/doc.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/gcc.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/godefs.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/main.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/out.go /usr/src/packages/system/gcc/src/gcc-8.5.0/gotools/../libgo/go/cmd/cgo/util.go zdefaultcc.go ../x86_64-foxkit-linux-musl/libgo/libgotool.a
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `setrlimit64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `fstat64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `__go_open64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `sendfile64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `stat64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `pwrite64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `mmap64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `ftruncate64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `getrlimit64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `readdir64_r'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `lstat64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `lseek64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `pread64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `truncate64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `fstatfs64'
/usr/x86_64-foxkit-linux-musl/bin/ld: ../x86_64-foxkit-linux-musl/libgo/.libs/libgo.so: undefined reference to `statfs64'
collect2: error: ld returned 1 exit status
make[2]: *** [Makefile:758: buildid] Error 1
make[2]: *** Waiting for unfinished jobs....