https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61359
--- Comment #2 from Kenneth Platz <kplatz at utdallas dot edu> --- I attempted to build the gcc-4.9.0 release, and it bombs out in libquadmath: gmake[4]: Leaving directory `/nfshomes/platzk/gnu/gcc-build/4.9.0/hppa2.0w-hp-hpux11.23/libffi/include' Making all in testsuite In file included from ../../../../gcc-4.9.0/libquadmath/math/x2y2m1q.c:19:0: ../../../../gcc-4.9.0/libquadmath/quadmath-imp.h:55:3: error: #error "No way!" # error "No way!" This appears to occur when there is no UINT_64 detected. This is on a PA-RISC 2.0 system, so the "unsigned long long" data type is available.