[vtkusers] Issues when using Mesa 11.2.2

[Patricio Palma C.]

Hello Expert

I'm testing VTK 7.1(git) with OpenGL2 using Mesa 11.2.2 and it fails at
when rendering the structure.

The first error I got is:

ERROR: In vtkShaderProgram.cxx, line 370
vtkShaderProgram (0xa385610): Error: GL_EXT_gpu_shader4: required extension
is not supported.
Error: failed to preprocess the source.

This was solved by defining MESA_GL_VERSION_OVERRIDE = 3.2

After that VTK request GLSL at least 1.50 then variable
MESA_GL_VERSION_OVERRIDE is defined as 150

After that I got the following message:

Program received signal SIGSEGV, Segmentation fault.
0x00002aaaaf55181b in vtkShaderProgram::FindUniform(char const*) () at
Rendering/OpenGL2/vtkShaderProgram.cxx:772
772   if (name == NULL || !this->Linked)

​Do you have any idea on how  I could solve this crash?

Regards​
-- 
Patricio Palma Contreras
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