[MacPorts] #56504: Failed to build gcc5

[MacPorts]

#56504: Failed to build gcc5
-------------------------+--------------------
 Reporter:  vlulla       |      Owner:  (none)
     Type:  defect       |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:  gcc5, proj4  |       Port:
-------------------------+--------------------
 :info:build
 /System/Library/Frameworks/CoreFoundation.framework/Headers/CFBase.h:663:61:
 error: expected initializer before 'API_AVAILABLE'
 :info:build  CFTypeRef CFAutorelease(CFTypeRef CF_RELEASES_ARGUMENT arg)
 API_AVAILABLE(macos(10.9), ios(7.0), watchos(2.0), tvos(9.0));
 :info:build                                                              ^

 I get this error while macports tries to update gcc5 for proj4.  I have
 already tried sudo port clean gcc5 && sudo port upgrade outdated and I
 still keep getting this error!

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Ticket URL: <https://trac.macports.org/ticket/56504>
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