The mpfun90 package will cause gfortran to seg fault during compilation. The problem appears to be due to an ambiguous interface. I'll attach a cutdowen version of the code.
-- Summary: Ambiguous INTERFACE leads to seg fault Product: gcc Version: 4.1.0 Status: UNCONFIRMED Severity: normal Priority: P2 Component: fortran AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: kargl at gcc dot gnu dot org CC: gcc-bugs at gcc dot gnu dot org GCC host triplet: freebsd-*-amd64 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24005