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We just included an eclass to simplify the fortran compiler dependency
and testing in ebuilds.
For the simplest case, which is most probably the way you want it,
simply add "fortran-2" to you inherit line. The only phase function
exported is pkg_setup, so take care to add "fortran-2_pkg_setup" in case
you redefined pkg_setup.
This will depend on a fortran compiler and check additionally for
general compiler functionality.
Two specialist cases are support.
First, you need openmp support from the fortran compiler, then simply
Second, you need a different fortran dialect. Normally this can be
identified, if the source files have different suffixes then .f e.g. .f90.
Simply define FORTRAN_STANDARD with the dialects you need.
Currently supported are the dialects from 77, 90, 95 and 03. 08 is
currently not, due to the lack of a working compiler.
I hope this will fix the problems due to missing fortran compilers.