[MacPorts] #63169: gimp does not build with an error in graphviz

[MacPorts]

#63169: gimp does not build with an error in graphviz
-------------------------+----------------------------------
  Reporter:  johnrmoyer  |      Owner:  (none)
      Type:  defect      |     Status:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.7.1
Resolution:              |   Keywords:  gimp strchr graphviz
      Port:  gimp        |
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Comment (by johnrmoyer):

 https://gitlab.com/graphviz/graphviz/-/issues/1785 suggests a fix because
 of a namespace collision with a llvm C++ library.


 Gimp suggests graphviz is an optional dependency

 https://github.com/aferrero2707/gimp-appimage/issues/61

 <blockquote>

 The solution is install graphviz packages. However that dependency seems
 to be optional as previous post

 INSTALL: adding infos about dot for "gegl:introspect" dependency.
 Especially now that this is not a blocking build dependency on GEGL, we
 want to have the information somewhere so that packagers (and other
 people building GIMP themselves) know this is at least an optional
 runtime dependency.

 This trick worked for me on Ubuntu-MATE 20.04
 Thanks a lot

 </blockquote>

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Ticket URL: <https://trac.macports.org/ticket/63169#comment:4>
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