Processing of port freecad fails

[Sean Farley]

Ryan Schmidt writes:

> On Jan 9, 2015, at 1:16 PM, Marius Schamschula wrote:
>> 
>> freecad used to declare +gcc48 as the default variant until  https://trac.macports.org/changeset/130949 was committed. Given that this change set deleted fortran related default variants for a number of packages, we will likely hear about these in the near future.
>
> Actually, in that revision, setting the default compiler variant was moved from the individual portfiles to the compilers portgroup.
>
> Then in r130953 the default was changed from gcc48 to gcc49. But what about the ports like freecad that don't have a gcc49 variant?

Welp, that's unintended. In cases like these, I imagined portfile
authors would override and add their own default variant. I'm a little
busy now, so if someone feels encouraged they can add it back.

A longer term fix would be to test for gcc49 and work backwards to
gcc48, etc.

Is there a reason why +gfortran was left out?