[cmake-developers] Suggest to not add libosgUI-NOTFOUND to OSG_INCLUDE_DIR if it wasn't required

[Mattias Helsing]

Hi all,
I'm building against OpenScenGraph-3.0.1 AND OpenSceneGraph-3.3.3.
While the latter have osgUI the former does not. My cmake scripts for
the 3.0.1 build fail because the OPENSCENEGRAPH_INCLUDE_DIR gets
populated with OSGUI_INCLUDE_DIR-NOTFOUND.
I can solve this with for loops (remove all item containing NOTFOUND)
but it's awkward. If I'm not requiring osgUI it shouldn't break my
build.


cheers
Mattias
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