Bug#847366: gtk apps die with 'Couldn't open libGL.so.1'

[Simon McVittie]

Control: tags 847366 + patch

On Fri, 20 Jan 2017 at 17:45:56 +0000, Simon McVittie wrote:
> Upstream say this is the wrong answer. Using Gtk without GL is *meant*
> to work - the problem is that one of the initialization calls is
> unconditional (upstream:
> <https://bugzilla.gnome.org/show_bug.cgi?id=775279>) and will abort
> if there is no GLX library available.

Patch attached, also in pkg-gnome svn, and seems to work fine (tested
with gtk3-demo in a chroot with no Recommends installed, and Xephyr
outside).

debian-installer developers: assuming you don't want a libgl1-udeb,
you will need either this fix applied to gtk+3.0, or GDK_GL=disable
in the environment whenever you run GTK apps. Either one should work.

I'll upload soon unless someone either does it for me, or tells me
that gtk+3.0/3.22.7-1 urgently needs to migrate.

    S
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