[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
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  Reporter:  macports@…  |      Owner:  ryandesign@…
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.3.0
Resolution:              |   Keywords:
      Port:  libpng      |
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Comment (by ryandesign@…):

 Replying to [comment:2 ryandesign@…]:
 > I will need to contact the libpng developers to see how we can fix these
 headers to let older versions of clang process them correctly.

 I did contact the developers; they put a fix into libpng 1.6.12rc03. The
 libpng port is at version 1.6.12 so it should include this fix, so it
 should be safe to revert r121508 now.

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Ticket URL: <https://trac.macports.org/ticket/43939#comment:7>
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