[MacPorts] #47564: port upgrade fails with error for package gmp

[MacPorts]

#47564: port upgrade fails with error for package gmp
-------------------------+--------------------------------
  Reporter:  vithlani@…  |      Owner:  macports-tickets@…
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.3
Resolution:              |   Keywords:
      Port:              |
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Comment (by larryv@…):

 Do you have the latest Xcode and Command Line Tools installed? The build
 is not detecting Clang correctly:
 {{{
 :debug:configure Using compiler 'System cc'
 }}}

 What’s the output from these commands?
 {{{
 % xcode-select --print-path
 % ls -dl /usr/include
 }}}

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Ticket URL: <https://trac.macports.org/ticket/47564#comment:2>
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