https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71839
--- Comment #2 from Anton Shterenlikht <mexas at bristol dot ac.uk> --- https://sourceforge.net/p/cgpack/code/HEAD/tree/head/tests/testAAF.f90 One would need to build the library first: https://sourceforge.net/p/cgpack/code/HEAD/tree/head/ I'll try to reduce the problem case.