[MacPorts] #64878: libgcc-devel is missing conflict with libgcc11

[MacPorts]

#64878: libgcc-devel is missing conflict with libgcc11
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 Reporter:  mojca   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  libgcc-devel libgcc11
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 I first installed gcc11, but had troubles with #63148.
 Installing gcc-devel failed when trying to activate libgcc-devel since
 libgcc11 was still active (but the conflict isn't listed).

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Ticket URL: <https://trac.macports.org/ticket/64878>
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