[MacPorts] #43939: libpng: pngconf.h:366:52: error: token is not a valid binary operator in a preprocessor subexpression

[MacPorts]

#43939: libpng: pngconf.h:366:52: error: token is not a valid binary operator in a
preprocessor subexpression
-------------------------+--------------------------
  Reporter:  macports@…  |      Owner:  ryandesign@…
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.0
Resolution:              |   Keywords:
      Port:  libpng      |
-------------------------+--------------------------

Comment (by ryandesign@…):

 Actually I'm not able to reproduce the original gegl build failure (on Mac
 OS X 10.6.8, with Xcode 3.2.6, with libpng downgraded to 1.6.10, with
 r121508 reverted from gegl).

 Daniel (I think?), it looks like we never asked you what version of Xcode
 and clang you're using. Could you let us know? Run "`clang -v`" to get the
 clang version; get info on the Xcode application in the Applications
 folder in the Developer folder to get the Xcode version. Thanks.

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Ticket URL: <https://trac.macports.org/ticket/43939#comment:9>
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