# How can I fix a build error?

**URL:** https://discourse.vtk.org/t/how-can-i-fix-a-build-error/4690
**Category:** Support
**Created:** [November 20, 2020, 6:54am UTC](https://discourse.vtk.org/t/how-can-i-fix-a-build-error/4690 "2020-11-20T06:54:40Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![SArbabi](https://discourse.vtk.org/letter_avatar_proxy/v4/letter/s/b5ac83/32.png) [@SArbabi](https://discourse.vtk.org/u/SArbabi)
#### Post date: [November 20, 2020, 8:57am UTC](https://discourse.vtk.org/t/how-can-i-fix-a-build-error/4690/2 "2020-11-20T08:57:14Z")

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Hi, this worked for me:

> [@9.0.0.rc1 ContextOpenGL2 not built](https://discourse.vtk.org/t/9-0-0-rc1-contextopengl2-not-built/2933/11):
>
> Hm okay. I just tested with curl -LO https://www.vtk.org/files/release/9.0/VTK-9.0.1.tar.gz tar xf VTK-9.0.1.tar.gz cd VTK-9.0.1/ mkdir build cd build cmake -DVTK\_MODULE\_ENABLE\_VTK\_RenderingContextOpenGL2=YES .. and I’m not getting that warning here. Full transcript here: [transcript.txt](https://discourse.vtk.org/uploads/short-url/7syuxChBKqrsfYMwACk7RXpWS7l.txt) (30.0 KB) Maybe it has something to with what groups/modules get enabled by default on your system. Would help to see the output from the CMake run.

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