Ok to merge it.

I don't use Paraview anymore on a daily basis. On my "new" machine, NixOS (nixpkgs-unstable) with nouveau driver, I got the following error:
vtkXOpenGLRenderWindow (0x3f213e0): Unable to find a valid OpenGL 3.2 or later implementation. Please update your video card driver to the latest version. If you are using Mesa please make sure you have version 11.2 or later and make sure your driver in Mesa supports OpenGL 3.2 such as llvmpipe or openswr.

I tried again and it builds fine with the nvidia driver, using the nixpkgs-unstable. Unfortunately, I don't know enough about linux graphics stack to be able to debug this 😞

Sorry I was not clear. Yes it builds fine and the error is in runtime. On my machine the GPU driver does not provide OpenGL 3.2:
$ glxinfo | grep "\(renderer\|version\)"

OpenGL renderer string: NV43
GLX version: 1.4
Max core profile version: 0.0
Max compat profile version: 2.1
Max GLES1 profile version: 1.1
Max GLES[23] profile version: 2.0
OpenGL version string: 2.1 Mesa 18.3.1
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16