[MacPorts] #56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together

[MacPorts]

#56941: cmake @3.12.0_0 and gcc7 @7.3.0_3 don't work well together
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  Reporter:  iqgrande    |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.3
Resolution:              |   Keywords:
      Port:  cmake, gcc  |
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Comment (by iqgrande):

 Hello @michaelld

 I did your suggestion already (I forced the uninstall) and it does make
 things work (see comment 13). Thank you for your dedicated sleuthing on
 this. Your responsiveness and suggestions were great!! Your help is much
 appreciated.

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Ticket URL: <https://trac.macports.org/ticket/56941#comment:15>
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