[MacPorts] #63676: gtk2 @2.24.33_0+quartz: error: use of undeclared identifier 'kCAContentsFormatRGBA8Uint'

[MacPorts]

#63676: gtk2 @2.24.33_0+quartz: error: use of undeclared identifier
'kCAContentsFormatRGBA8Uint'
--------------------------+--------------------
 Reporter:  sambthompson  |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.7.1
 Keywords:  elcapitan     |       Port:  gtk2
--------------------------+--------------------
 Trying to upgrade from 2.24.32_0. Build fails at:

 {{{
 GdkQuartzView.c:612:28: error: use of undeclared identifier
 'kCAContentsFormatRGBA8Uint'
 }}}

 Log attached. Maybe co-incidental, but `GdkQuartzView.c` seems to have
 picked up a new/changed patch at
 [changeset:442f16956bc8321c3d3a006e28e2c27cb202c8a3/macports-ports commit
 442f169].

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Ticket URL: <https://trac.macports.org/ticket/63676>
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