[oe] gtk 2.6/2.8 vs 2.10

[Koen Kooi]

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Hi,

A while ago gtk 2.10 was added to OE with a negative default preference since not all the
patches have been forward ported yet. Gtk 2.10 also bumped their ABI version to 2.10,
which leads to some interesting problems:

* do_install for packages dependant on gtk+ breaks since ${libdir}/gtk-2.0/2.4.0/ is now
${libdir}/gtk-2.0/2.10.0/
* some package build against 2.8 but not against 2.10 and vice versa

A lot of these problems can be solved with 'preferred-gtk-2.8-versions.inc', but ideally
we'd want a way to get the gtk PV from inside other recipes (e.g. gtk-engines).

Does anyone have a good idea on how to handle all this?

regards,

Koen
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