[MacPorts] #58447: tk @8.6.9_2 +quartz -x11 fails to build due to duplicate headers in /opt/local/include/X11{, tk}

[MacPorts]

#58447: tk @8.6.9_2 +quartz -x11 fails to build due to duplicate headers in
/opt/local/include/X11{,tk}
--------------------------+---------------------------------
  Reporter:  michaellass  |      Owner:  MarcusCalhoun-Lopez
      Type:  defect       |     Status:  accepted
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:
      Port:  tk           |
--------------------------+---------------------------------

Comment (by MarcusCalhoun-Lopez):

 This problem was inadvertently created by a [https://github.com/macports
 /macports-ports/commit/d7b3b4360c105b7e287eb055dd1ccc6c4cde2ac0 recent
 change].\\
 Removing `configure.cppflags  -I${workpath}/tcl${version}/generic` was
 correct in the senes that `${workpath}/tcl${version}/generic`
 [https://github.com/macports/macports-
 ports/commit/453df368d934751552c56808c037452432777665 no longer exists].\\
 However, the default `configure.cppflags` is now causing this problem.

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Ticket URL: <https://trac.macports.org/ticket/58447#comment:3>
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