[MacPorts] #51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5

[MacPorts]

#51245: libgcc-devel @6-20160421_0 build fails on OS X 10.10.5
-----------------------------------+----------------------
  Reporter:  mopihopi@…            |      Owner:  mww@…
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.3.4
Resolution:                        |   Keywords:  haspatch
      Port:  libgcc, libgcc-devel  |
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Comment (by napierdmark@…):

 Replying to [comment:28 ryandesign@…]:
 > Has duplicates #51322, #51323.
 OK, google is not helping.  How do I modify my portfile to get gcc5 shown
 in comment #18?  Trying to install gnuradio.  Macports manipulation not in
 my wheelhouse.

 Tried a clean build with the setting in comment #22.  Didn't seem to make
 any difference.

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Ticket URL: <https://trac.macports.org/ticket/51245#comment:29>
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