[MacPorts] #41658: metis: Add gcc48 variant

[MacPorts]

#41658: metis: Add gcc48 variant
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  Reporter:  sylvain.desroziers@…  |      Owner:  macports-tickets@…
      Type:  enhancement           |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.2.1
Resolution:                        |   Keywords:  haspatch
      Port:  metis                 |
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Comment (by sylvain.desroziers@…):

 gcc48 is most recent stable compiler from gnu. I develop scientific code
 under MacOS and I need great portability. I know my patch isn't sufficient
 and could be improve for all gcc version provided by macport. For
 information, scientifics (around me) developping under MacOS always
 compile themselves scientific librairies and don't really use macports as
 they should. Using gcc48 is a strong requirement. But I understand the
 complexity to provide ports tuned for several compilers... Thanks for your
 answer. It's maybe a non-usefull contribution but I share it.

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Ticket URL: <https://trac.macports.org/ticket/41658#comment:3>
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