[vtkusers] X.org FC4 no GL windows

[Kevin H. Hobbs]

On Wed, 2006-03-15 at 12:24 -0500, Kevin H. Hobbs wrote:
> When I build VTK with almost no changes ( release or debug mode ) in
> cmake everything is mostly fine.  When I make changes as in the attached
> CMakeCache.txt, VTK can no longer create GL windows. I get the error
> below during tests:
> 
> 
> X Error of failed request:  BadWindow (invalid Window parameter)
>   Major opcode of failed request:  2 (X_ChangeWindowAttributes)
>   Resource id in failed request:  0x0
>   Serial number of failed request:  89
>   Current serial number in output stream:  90
> 
> For some reason I suspect the linking in the off screen library. I guess
> because it's the only directly GL thing I did.

Indeed if I disable the offscreen options vtk tests fine.  I guess my
openGL does not support offscreen calls even though it
provides /usr/include/GL/osmesa.h and /usr/X11R6/lib64/libOSMesa.so.
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