[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:              |
-------------------------+--------------------------------

Comment (by larryv@…):

 Replying to [comment:4 vithlani@…]:
 > {{{
 > $ xcode-select -p
 > /Library/Developer/CommandLineTools
 > }}}

 We don’t support using the CLT as your active developer directory. Try
 this:
 {{{
 % sudo xcode-select --switch /Applications/Xcode.app
 % sudo port clean gmp
 % sudo port upgrade outdated
 }}}
 If that still fails, please attach your new `main.log` and the
 `config.log` (which should be in `$(port work gmp)/gmp-6.0.0` somewhere).

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Ticket URL: <https://trac.macports.org/ticket/47564#comment:5>
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