Since git hash e8f2db41 "Drop explicit support for Fortran 77 in Cactus" of cactus (about 4 years ago) Cactus has no longer supported F77 options and derived them from F90 options.

Two options were missed though: F77_OPENMP_FLAGS and F77_VERSION. Pull request https://bitbucket.org/cactuscode/cactus/pull-requests/64/rhaas-openmp-f77flags/diff adds those.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2284/set-f77_openmp_flags-from-f90_openmp_flags