[MacPorts] #64997: Cannot build libgcc9 under Monterey

[MacPorts]

#64997: Cannot build libgcc9 under Monterey
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  Reporter:  keldhelsgaun  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:
      Port:                |
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Comment (by keldhelsgaun):

 That didn't solve my problem.
 Execution of 'port installed depends:gcc9' gave only one result: 'libgcc8
 @8.3.0.5'.

 The page https://ports.macports.org/port/libgcc9/details/ reports that
 libgcc9 has a problem under Monterey (x86-64).

 Since https://ports.macports.org/port/libgcc10/details/ does not report a
 problem for libgcc10 under Monterey (x86-64), I tried to install gcc10.
 However, this installation also failed. The log said "build error:
 configuring for an unreleased macOS version x86_64-apple-darwin21".

 I have also tried to install gcc11, but this unfortunately begins with an
 unsuccessful attempt to install libgcc9.

 So what can I do now? Do you need more information from me?

 If libgcc9, gcc9, gcc9, gcc10 and gcc11 are currently not compatible with
 Monterey, how can I safely delete them?

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Ticket URL: <https://trac.macports.org/ticket/64997#comment:2>
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