[Bug 770988] GL plugin build calls g-ir-scanner with GL_CFLAGS but not the matching GL_LIBS.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770988

--- Comment #2 from Alistair Buxton <a.j.buxton at gmail.com> ---
It only fails if you need a -L argument for the compiler to find the GL libs.
If they are in standard paths then gstgl will be linked to them, meaning that
they'll pulled in indirectly - with all the autotools fun that brings.

If however you need a -L then because of the other bug, everyone just puts it
into global LIBS or LDFLAGS. But g-ir-scanner ignores those. But most people
who need -L for this are cross compiling and don't even bother to try building
G-I because they've been told it's so hard. (Turns out it is actually very easy
for arm - install qemu with binfmt support for the target arch and make sure
the sysroot is set up right and it "just works" except for this one plugin.)

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