[MacPorts] #61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina

[MacPorts]

#61653: gimp-gap-devel @2.7.0-20191012+quartz fails to build on Catalina
-----------------------------+----------------------
  Reporter:  p-bro           |      Owner:  dbevans
      Type:  defect          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:
      Port:  gimp-gap-devel  |
-----------------------------+----------------------

Comment (by p-bro):

 ...but then downgrading command line tools to 11.5 (and selecting them
 with {{{sudo xcode-select -s /Library/Developer/CommandLineTools/}}} )
 actually worked. I'll leave the bug here, as this is not a sustainable
 solution.

-- 
Ticket URL: <https://trac.macports.org/ticket/61653#comment:3>
MacPorts <https://www.macports.org/>
Ports system for macOS