[MacPorts] #54900: libgcc @7.2.0: fatal error: bits/regex_scanner.tcc: No such file or directory

[MacPorts]

#54900: libgcc @7.2.0: fatal error: bits/regex_scanner.tcc: No such file or
directory
---------------------------+------------------------
  Reporter:  cjones051073  |      Owner:
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:  highsierra
      Port:  libgcc        |
---------------------------+------------------------

Comment (by cjones051073):

 OK, libgcc and gcc7 built fine with the above patch. I'll submit an update
 for this shortly.

 Unfortunately a similar fix fo gcc6 does not seem to work. See attached
 build log. If anyone has any ideas o this I would like to hear ?

 Chris

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Ticket URL: <https://trac.macports.org/ticket/54900#comment:15>
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