[MacPorts] #59677: gmic @2.7.5_1: build fails on macOS 10.10 buildbot

[MacPorts]

#59677: gmic @2.7.5_1: build fails on macOS 10.10 buildbot
---------------------+-------------------------
 Reporter:  dbevans  |      Owner:  Schamschula
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  gmic
---------------------+-------------------------
 {{{
 cd ../gmic-qt && /opt/local/libexec/qt5/bin/qmake CONFIG+=release
 GMIC_PATH=/opt/local/var/macports/build/_opt_bblocal_var_buildworker_ports_build_ports_science_gmic/gmic/work/gmic-2.7.5/src
 PRERELEASE= HOST=gimp gmic_qt.pro &&
 /Library/Developer/CommandLineTools/usr/bin/make
 Project ERROR: Could not resolve SDK --show-sdk-path for 'macosx'
 }}}

 Logfile attached.

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Ticket URL: <https://trac.macports.org/ticket/59677>
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