[MacPorts] #60093: gtkglext @1.2.0_11 +quartz does not configure on macOS Catalina, Version 10.15.3, because 'configure: error: X development libraries not found'

[MacPorts]

#60093: gtkglext @1.2.0_11 +quartz does not configure on macOS Catalina, Version
10.15.3, because 'configure: error: X development libraries not found'
------------------------+----------------------
  Reporter:  ballapete  |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.6.2
Resolution:             |   Keywords:  catalina
      Port:  gtkglext   |
------------------------+----------------------

Comment (by ballapete):

 It seems `Portfile` is missing a line

 {{{
 configure.args-append  --with-gdktarget=quartz
 }}}

 And when this line is added, build fails with:

 {{{
 In file included from gdkglquery-quartz.c:23:
 ./gdkglquartz.h:5:10: fatal error: 'gdk/gdkquartz.h' file not found
 #include <gdk/gdkquartz.h>
          ^~~~~~~~~~~~~~~~~
 }}}

 The C header file `gdkquartz.h` does not get installed:

 {{{
 extracting quartz to quartz.tbz.txt
 x quartz/
 x quartz/gdkglconfig-quartz.c
 x quartz/gdkglconfig-quartz.h
 x quartz/gdkglcontext-quartz.c
 x quartz/gdkglcontext-quartz.h
 x quartz/gdkgldrawable-quartz.c
 x quartz/gdkglfont-quartz.c
 x quartz/gdkglpixmap-quartz.c
 x quartz/gdkglpixmap-quartz.h
 x quartz/gdkglprivate-quartz.h
 x quartz/gdkglquartz.h
 x quartz/gdkglquery-quartz.c
 x quartz/gdkglwindow-quartz.c
 x quartz/gdkglwindow-quartz.h
 x quartz/Makefile.am
 x quartz/Makefile.in
 quartz folder already exists
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/60093#comment:2>
MacPorts <https://www.macports.org/>
Ports system for macOS