[MacPorts] #39428: mpich should have variant +gcc47 by default

[MacPorts]

#39428: mpich should have variant +gcc47 by default
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  Reporter:  dstrubbe@…   |      Owner:  eborisch@…
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.1.3
Resolution:               |   Keywords:  haspatch
      Port:  mpich        |
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Comment (by eborisch@…):

 I believe, but I could be wrong, that active variants can be used to say
 if port X is installed it, must have variant C or D active. (Else error
 out with an informative message to user.) If X is not installed, then
 error out with informative message to user that X needs to be installed
 with C or D active.

 It seems this would suffice for the problem you're describing.

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Ticket URL: <https://trac.macports.org/ticket/39428#comment:4>
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