CFITSIO's Fortran interface

[Sébastien Maret]

> Le 10 févr. 2016 à 16:23, Ryan Schmidt <ryandesign at macports.org> a écrit :
> 
> On Feb 10, 2016, at 8:52 AM, Sébastien Maret wrote:
> 
>> I am maintaining the Gildas port which depends on the CFITSIO library. CFITSIO has a Fortran interface but it is not built by default: one need to select a specific variant (e.g. +gcc 5) for this. This is a problem for the Gildas because the compilation fails without the Fortran interface:
>> https://trac.macports.org/ticket/50543
>> 
>> Is there a way for a port to depend on a specific variant of another port? If not then how can I solve this?
> 
> The require_active_variants procedure in the active_variants 1.1 port group.

Thanks. I’ve added the cfitsio +gcc5 in require_active_variants and this solves the problem on Yosemite:
https://trac.macports.org/changeset/145605

However the compilation fails on older MacOS versions because the +gcc5 variant is not available. I don’t need the gcc5 variant in particular; any of the gcc4x should be fine. How can I do this with require_active_variants?

Sébastien