[MacPorts] #60449: gcc10 missing header <wchar.h>

[MacPorts]

#60449: gcc10 missing header <wchar.h>
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  Reporter:  haberg-1  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.2
Resolution:            |   Keywords:  catalina
      Port:  gcc10     |
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Comment (by haberg-1):

 It works after running 'xcode-select —install', both gcc9 and gcc10. I had
 it installed before, but perhaps it was lost in some update; a working
 compiler in /usr/bin/clang++, though. Before, I had bin/ in
 /Library/Developer/CommandLineTools/usr/, but not include/, which is now
 present. Also, gcc9 may have worked before, but not after removing and
 reinstalling. But clang-10 worked, so it may be different in this respect.

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Ticket URL: <https://trac.macports.org/ticket/60449#comment:11>
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