[MacPorts] #71631: pngcrush @1.8.13: fatal error: 'fp.h' file not found

[MacPorts]

#71631: pngcrush @1.8.13: fatal error: 'fp.h' file not found
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  Reporter:  kpreid    |      Owner:  nerdling
      Type:  defect    |     Status:  accepted
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.10.5
Resolution:            |   Keywords:
      Port:  pngcrush  |
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Comment (by ryandesign):

 The fp.h problem is a libpng bug only seen on recent versions of clang and
 described and fixed here:

 https://github.com/pnggroup/libpng/pull/529

 FYI optipng is an alternative to pngcrush that is also available in
 MacPorts.

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Ticket URL: <https://trac.macports.org/ticket/71631#comment:6>
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