Compiling src/mess/formats/imd_dsk.c... cc1.exe: warnings being treated as errors src/mess/formats/imd_dsk.c: In function 'imd_dsk_identify': src/mess/formats/imd_dsk.c:39: warning: 'and' of mutually exclusive equal-tests is always 0 mingw32-make: *** [obj/windows/mess/mess/formats/imd_dsk.o] Error 1