[MacPorts] #56292: fix ccpnmr package so that it actually builds again

[MacPorts]

#56292: fix ccpnmr package so that it actually builds again
--------------------------+---------------------------------
  Reporter:  jwhowarth    |      Owner:  (none)
      Type:  enhancement  |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch maintainer
      Port:  ccpnmr       |
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Comment (by kencu):

 although macports-clang-3.7 does support openmp, it does so only with the
 variant applied. 3.8 and later support it by default. So the blacklisting
 of up to and include 3.7 seems appropriate.

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Ticket URL: <https://trac.macports.org/ticket/56292#comment:9>
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