I'm trying to build gcc-7.1.0 on mingw64, and it fails with the following error: make[2]: Entering directory '/home/JW/build-gcc-msys/gcc' x86_64-w64-mingw32-gcc -nostdinc -x c /dev/null -S -o /dev/null -fself-test=../../gcc-7.1.0/gcc/testsuite/selftests x86_64-w64-mingw32-gcc: error: unrecognized command line option ‘-fself-test=../../gcc-7.1.0/gcc/testsuite/selftests’ make[2]: *** [Makefile:1933: s-selftest] Error 1 make[2]: Leaving directory '/home/JW/build-gcc-msys/gcc' make[1]: *** [Makefile:4246: all-gcc] Error 2 make[1]: Leaving directory '/home/JW/build-gcc-msys' make: *** [Makefile:909: all] Error 2 That seems like an odd error message. Am I doing something wrong here?