defined via Mk/bsd.default-versions.mk which has moved from GCC 7.4 t GCC 8.2 under most circumstances. This includes ports - with USE_GCC=yes or USE_GCC=any, - with USES=fortran, - using Mk/bsd.octave.mk which in turn features USES=fortran, and - with USES=compiler specifying openmp, nestedfct, c11, c++0x, c++11-lang, c++11-lib, c++14-lang, c++17-lang, or gcc-c++11-lib plus, as a double check, everything INDEX-11 showed depending on lang/gcc7. PR: 231590