# undefined reference to \`glXQueryVersion' with ParaView 5.7.0RC1 and EGL combination
**URL:** https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196
**Category:** ParaView Support
**Tags:** opengl
**Created:** [July 11, 2019, 4:58am UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196 "2019-07-11T04:58:17Z")
**Posts on this page:** 7
**Page:** 1
### Author:  [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)
#### Post date: [July 11, 2019, 4:58am UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/1 "2019-07-11T04:58:17Z")
Hi,
I am getting following error when I try to install ParaView 5.7.0RC1 with EGL support,
[95%] Building CXX object VTK/Rendering/OpenGL2/CMakeFiles/vtkProbeOpenGLVersion.dir/vtkProbeOpenGLVersion.cxx.o
[95%] **Linking CXX executable …/…/…/bin/vtkProbeOpenGLVersion-pv5.7**
…/…/…/lib64/libvtkglew-pv5.7.so.5.7: undefined reference to `glXQueryVersion' ../../../lib64/libvtkglew-pv5.7.so.5.7: undefined reference to`glXGetProcAddressARB’
…/…/…/lib64/libvtkglew-pv5.7.so.5.7: undefined reference to `glXGetClientString’
I could build 5.6.1 in the same environment with our any problem.
–ufuk
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### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [July 11, 2019, 12:08pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/2 "2019-07-11T12:08:05Z")
Hmm. Is `VTK_USE_X` set?
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### Author:  [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)
#### Post date: [July 11, 2019, 3:53pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/3 "2019-07-11T15:53:16Z")
No, it is set as OFF.
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### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [July 11, 2019, 7:42pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/4 "2019-07-11T19:42:41Z")
Hmm. Does it work if you turn it `ON`? If it does, we should look into getting `vtkglew` to work when `VTK_USE_X` is disabled.
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### Author:  [@uturuncoglu](https://discourse.paraview.org/u/uturuncoglu)
#### Post date: [July 12, 2019, 4:00pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/5 "2019-07-12T16:00:09Z")
Hi Ben,
I could able to compile when i set VTK\_USE\_X ON. Do you think that there
is a bug in 5.7.0RC1? I think i could not use EGL with this version
because it will try to open a X window. Right? Thanks for your help.
–ufuk
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### Author:  [@ben.boeckel](https://discourse.paraview.org/u/ben.boeckel)
#### Post date: [July 15, 2019, 12:31pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/6 "2019-07-15T12:31:03Z")
I think there’s something not being passed down to the glew build to disable X symbol usage. @martink?
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### Author:  [@jaswantp](https://discourse.paraview.org/u/jaswantp)
#### Post date: [January 22, 2023, 7:09pm UTC](https://discourse.paraview.org/t/undefined-reference-to-glxqueryversion-with-paraview-5-7-0rc1-and-egl-combination/2196/7 "2023-01-22T19:09:58Z")
Nearly 4 years later…
Just got burnt by this one with the ongoing emscripten work. X gets disabled in `vtkOpenGLOptions.cmake` for emscripten. `vtkglew` does not include that script and assumes X is enabled, goes ahead to call glX funcs, ends up with undefined refs.
I suspect the order of `vtk_source_directories` causes trouble. `VTK_USE_X` is set in `vtkOpenGLOptions.cmake`, include by `Utilities/OpenGL` module. However, the `Utilities` directory is scanned after `Thirdparty/`.
Explains why one needed to add `-DVTK_OPENGL_USE_GLES=ON` on the command line for configure. Anyway, including `vtkOpenGLOptions.cmake` in `Thirdparty/glew/CMakeLists.txt` fixed it. Will open a mr for this.