[MacPorts] #61586: gimp +quartz does not build under Big Sur

[MacPorts]

#61586: gimp +quartz does not build under Big Sur
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  Reporter:  MaurizioLoreti  |      Owner:  (none)
      Type:  defect          |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gimp            |
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Comment (by MStraeten):

 Replying to [comment:5 kencu]:
 ****
 >
 > however --- this happened:
 > {{{
 > % gimp
 > 2020-11-22 00:27:04.190 gimp[706:6788] *** WARNING: Method
 userSpaceScaleFactor in class NSView is deprecated on 10.7 and later. It
 should not be used in new applications. Use convertRectToBacking: instead.
 > Assertion failed: (!surface->finished), function
 _cairo_surface_release_source_image, file cairo-surface.c, line 2092.
 > gimp: fatal error: Abort trap: 6
 > }}}
 this seems to be due to cmake @3.19.1_0
 i got this error when building darktable after upgrading to cmake
 @3.19.1_0 but not after reactivating cmake @3.18.5_0

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Ticket URL: <https://trac.macports.org/ticket/61586#comment:8>
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