[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):

 Yes, I am aware of those variations, but gcc9 and clang-10 work without
 that, so you might check what they do. And the command line tools package
 does not help here, as /usr/include/ does not exist.

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Ticket URL: <https://trac.macports.org/ticket/60449#comment:5>
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