[MacPorts] #54829: libgcc6 @6.4.0: fatal error: bits/locale_facets.h: No such file or directory

[MacPorts]

#54829: libgcc6 @6.4.0: fatal error: bits/locale_facets.h: No such file or
directory
----------------------+------------------------
  Reporter:  braslau  |      Owner:
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.4.1
Resolution:           |   Keywords:  highsierra
      Port:  libgcc6  |
----------------------+------------------------

Comment (by cjones051073):

 Turning off parallel builds worked for me with gcc6. Slow as heck, but
 worked...

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Ticket URL: <https://trac.macports.org/ticket/54829#comment:12>
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