pkg/50238: "gtk3" package doesn't build under Mac OS X Yosemite

[tron%zhadum.org.uk@localhost]

>Number:         50238
>Category:       pkg
>Synopsis:       "gtk3" package doesn't build under Mac OS X Yosemite
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Sep 13 14:25:00 +0000 2015
>Originator:     tron%zhadum.org.uk@localhost
>Release:        Darwin 14.5.0
>Organization:
Matthias Scheler                                 https://zhadum.org.uk/
>Environment:
System: Darwin excalibur.zhadum.org.uk 14.5.0 Darwin Kernel Version 14.5.0: Wed Jul 29 02:26:53 PDT 2015; root:xnu-2782.40.9~1/RELEASE_X86_64 x86_64
Architecture: x86_64
Machine: i386
>Description:
The "gtk3" package (which is now required by the "wireshark" package) fails
to build under Macs OS Yosemite:

  CC       gdkkeys-x11.lo
In file included from gdkglcontext-x11.c:23:
./gdkglcontext-x11.h:28:10: fatal error: 'epoxy/glx.h' file not found
#include <epoxy/glx.h>
         ^
In file included from gdkdisplay-x11.c:40:
./gdkglcontext-x11.h:28:10: fatal error: 'epoxy/glx.h' file not found
#include <epoxy/glx.h>
         ^
1 error generated.
gnumake[4]: *** [gdkdisplay-x11.lo] Error 1
gnumake[4]: *** Waiting for unfinished jobs....
1 error generated.
gnumake[4]: *** [gdkglcontext-x11.lo] Error 1
gnumake[3]: *** [all-recursive] Error 1
gnumake[2]: *** [all] Error 2
gnumake[1]: *** [all-recursive] Error 1
gnumake: *** [all] Error 2
*** Error code 2

The file "epoxy/glx.h" is not part of the "libepoxy" package under Mac OS X.
The GLX is flavour is by purpose not built under Mac OS X.

I'm using the latest version of Mac OS X Yosemite with the latest version
of Xcode from the App Store and pkgsrc HEAD sources from 2015-09-13 07:00 UTC.

>How-To-Repeat:
cd pkgsrc/x11/gtk3
bmake

>Fix:
Not known