[MacPorts] #63868: tk @8.6.12: error: use of undeclared identifier 'NSBitmapFormatAlphaFirst' (was: Failed to build Tcl/Tk version 8.6.12)

[MacPorts]

#63868: tk @8.6.12: error: use of undeclared identifier 'NSBitmapFormatAlphaFirst'
------------------------+---------------------------------
  Reporter:  macdeport  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.7.1
Resolution:             |   Keywords:  yosemite
      Port:  tk         |
------------------------+---------------------------------
Changes (by ryandesign):

 * keywords:   => yosemite
 * owner:  (none) => MarcusCalhoun-Lopez
 * status:  new => assigned
 * port:  tk 8.6.12 => tk


Comment:

 [https://developer.apple.com/documentation/appkit/nsbitmapformat/nsbitmapformatalphafirst?language=objc
 Apple says] `NSBitmapFormatAlphaFirst` was introduced in macOS 10.12 and
 your log shows you are on 10.10. Hopefully there is a way that we don't
 have to require macOS 10.12 for tk; that would be unfortunate.

-- 
Ticket URL: <https://trac.macports.org/ticket/63868#comment:2>
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