[MacPorts] #61475: gmp: configure: error: could not find a working compiler, see config.log for details

[MacPorts]

#61475: gmp: configure: error: could not find a working compiler, see config.log
for details
-----------------------+---------------------------------
  Reporter:  Boose101  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect    |     Status:  assigned
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.4
Resolution:            |   Keywords:
      Port:  gmp       |
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Comment (by snarkhunter):

 I'm seeing this same error on a Catalina system on which I had upgraded
 Xcode to 12.2.  I then saw that we were advised not to do that yet, so I
 downloaded Xcode 11.7 and used xcode-select to choose it.  I am *not*
 having this problem on another Catalina system that was never upgraded to
 12.2.  I have not seen the problem on other ports on the system that was
 temporarily upgraded.

 Both systems build everything from source because I need to use a non-
 standard location for ports.

 -- Steve

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Ticket URL: <https://trac.macports.org/ticket/61475#comment:5>
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