[MacPorts] #48522: ifeffit, p5-ifeffit, pgplot: add gcc5 variant

[MacPorts]

#48522: ifeffit, p5-ifeffit, pgplot: add gcc5 variant
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  Reporter:  ryandesign@…                 |      Owner:  joe.fowler@…
      Type:  enhancement                  |     Status:  new
  Priority:  Normal                       |  Milestone:
 Component:  ports                        |    Version:
Resolution:                               |   Keywords:
      Port:  ifeffit, p5-ifeffit, pgplot  |
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Comment (by mojca@…):

 I committed r148587, but I'm not yet sure how to add a runtime dependency
 on gcc. I changed that because `p5-ifeffit` build was broken on the
 buildbot, but I would be grateful if someone could review it.

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Ticket URL: <https://trac.macports.org/ticket/48522#comment:9>
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