gimp2 @2.10.0: Error: missing dependency libmypaint >= 1.3.0

[ryandesign (Ryan Carsten Schmidt)]

gimp2 fails to build if MyPaint @1.2.1 is installed:

Error: GIMP configuration failed.
  - Error: missing dependency libmypaint >= 1.3.0

This is because gimp2 declares its dependency on libmypaint as path:lib/pkgconfig/libmypaint.pc:libmypaint. The dependency should be changed to port:libmypaint because only the version of libmypaint provided by the libmypaint port (and not the version provided by the MyPaint port) is acceptable to gimp2.

[pmetzger (Perry E. Metzger)]

ryandesign: question: as a matter of policy, when we're making reports like this internally (that is, when the reporter and port maintainer both are project members), should we be using Trac or just doing a pull request? I'm torn, I can see arguments for both. It is certainly quicker to just use Trac for example. Thoughts?

[ryandesign (Ryan Carsten Schmidt)]

A Trac ticket affords me the opportunity to attach a log file.

Dave may have other ideas about how to fix the problem. He knows his port better than I do.

Doing a pull request for someone else's port feels like me doing their work for them, and I don't always have time to do that. But I recognize that in some cases simply doing the work takes less time than explaining what needs to be done.

[dbevans (David B. Evans)]

In 1d449dad686871a9ca106a8738aed27d54f3f200/macports-ports (master):

gimp2, gimp2-devel, gimp3-devel: fix libmypaint dependency

While MyPaint provides a version of libmypaint, it is too
old for the current gimp builds. Switch from path depspec
to port depspec to ensure build with libmypaint >= 1.3.0.

Closes #56444.