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

[MacPorts]

#60449: gcc10 missing header <wchar.h>
----------------------+--------------------
 Reporter:  haberg-1  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.6.2
 Keywords:  catalina  |       Port:  gcc10
----------------------+--------------------
 When installing gcc10 and compiling externally with
 /opt/local/bin/g++-mp-10 the error below appears, possibly because system
 headers that GCC relies on, have on MacOS 10.5 been moved away from
 /usr/include/.

 In file included from /opt/local/include/gcc10/c++/bits/postypes.h:40,
                  from /opt/local/include/gcc10/c++/iosfwd:40,
                  from /opt/local/include/gcc10/c++/ios:38,
                  from /opt/local/include/gcc10/c++/ostream:38,
                  from /opt/local/include/gcc10/c++/iostream:39,
                  from c++version.cc:2:
 /opt/local/include/gcc10/c++/cwchar:44:10: fatal error: wchar.h: No such
 file or directory
    44 | #include <wchar.h>
       |          ^~~~~~~~~
 compilation terminated.

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