Bug#878702: mutter: FTBFS on kFreeBSD: PFNEGLQUERYDMABUFFORMATSEXTPROC unknown

[Aaron M. Ucko]

Source: mutter
Version: 3.26.1-4
Severity: important
Tags: upstream
Justification: fails to build from source (but built successfully in the past)
User: debian-bsd at lists.debian.org

Builds of mutter for kfreebsd-amd64 and kfreebsd-i386 (admittedly not
release architectures) have been failing lately with a cascade of
errors and warnings stemming from

  backends/meta-egl.c:70:3: error: unknown type name 'PFNEGLQUERYDMABUFFORMATSEXTPROC'
  backends/meta-egl.c:71:3: error: unknown type name 'PFNEGLQUERYDMABUFMODIFIERSEXTPROC'

I suspect builds for hurd-i386 (not a release architecture either)
would fail in the same fashion, but mutter is currently in Dep-Wait
there.  (It's waiting for libgbm-dev from recent mesa, which is in
turn waiting for libglvnd, which FTFBS on non-Linux per #870445.
However, there may well be other latent complications on that front.)

At any rate, could you please take a look and conditionalize the usage
of these symbols appropriately?

Thanks!

-- 
Aaron M. Ucko, KB1CJC (amu at alum.mit.edu, ucko at debian.org)
http://www.mit.edu/~amu/ | http://stuff.mit.edu/cgi/finger/?amu@monk.mit.edu