[vtkusers] Build VTK module without OpenGL

[ramesh santhanam]

Hi
A while back (2015) a similar query  was posted. I have version 7.1 of the
Vtk src and am interested in only
the modules viz. vtkIOImport, vtkIOEnsight which should be void of any
OpenGL dependency (based on my understanding). I tried following the
solution suggested in the thread but without much success. I am possibly
missing something. Any pointers would be appreciated.

cmake -DVTK_Group_StandAlone:BOOL=OFF -DVTK_Group_Rendering:BOOL=OFF
-DVTK_RENDERING_BACKGROUND=OpenGL2 -DModule_vtkIOEnSight:BOOL=ON
-DVTK_BUILD_ALL_MODULES_FOR_TESTS:BOOL=OFF ..


but get errors as shown below:

--  * vtktiff, needed by vtkIOImage.

--  * vtkzlib, needed by 6 modules:

        vtkIOCore

        vtkIOImage

        vtkMetaIO

        vtkfreetype

        vtkpng

        vtktiff

CMake Error at
/usr/local/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:148
(message):

  Could NOT find OpenGL (missing: OPENGL_gl_LIBRARY OPENGL_INCLUDE_DIR)

Call Stack (most recent call first):


/usr/local/share/cmake-3.5/Modules/FindPackageHandleStandardArgs.cmake:388
(_FPHSA_FAILURE_MESSAGE)

  /usr/local/share/cmake-3.5/Modules/FindOpenGL.cmake:172
(FIND_PACKAGE_HANDLE_STANDARD_ARGS)

  src/Components/VTK/CMake/vtkOpenGL.cmake:77 (find_package)

  src/Components/VTK/ThirdParty/glew/vtkglew/CMakeLists.txt:3 (include)

====


Thanks

Ramesh
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