Bug#365317: lablgtk2: remove the dependency on OpenGL

[Samuel Mimram <samuel.mimram@ens-lyon.org>]

Hi Manu,

Emmanuel Beffara wrote:
> It would be really nice to move the OpenGL part of LablGtk into a separate
> package, so that the liblablgtk2 packages don't depend on them. In the current
> state of things, installing liblablgtk2-ocaml-dev requires installing Mesa
> libraries. Also, liblablgtk2-ocaml-dev depends on liblablgl-ocaml-dev, which
> in turn requires Tcl/Tk development packages. On the whole, on my system with
> an OpenGL-free Xorg 7 installed, installing lablgtk2 requires 52Mb of useless
> dependencies.
> 
> I don't know if GtkGL support can be built into a package by itself, but maybe
> providing two versions of the package, one with GL and one without, would be
> enough.

We've done it in the past to move away the gnome-specific dependencies
in liblablgtk2-gnome-ocaml, so it should not be so much of a problem.
I'll try to split the opengl dependencies in liblablgtk2-gl-ocaml in the
next few days.

Cheers,

Samuel.