# Missing Library by configuration in Cmake & Sphere Example doesn't work
**URL:** https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978
**Category:** Support
**Created:** [June 11, 2021, 1:39am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978 "2021-06-11T01:39:01Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Hassna87](https://discourse.vtk.org/u/Hassna87)
#### Post date: [June 11, 2021, 1:39am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978/1 "2021-06-11T01:39:01Z")
Hello everybody,
I’m new to VTK, and I have some issues here.
After doing the configuration in Cmake, Build\_Examples did not appear within the result of configuration:
However, I have completed all the steps (generating, building solution file…etc) and then tried to run the Sphere example, by the configuration in cmake it shows “Skipping Sphere”
As a result, there is missing folders in bin and i’m not able to move further.
Do you have any suggestion for me here?
Thanks 🙂
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### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [June 11, 2021, 11:48am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978/2 "2021-06-11T11:48:09Z")
The flag is called `VTK_BUILD_EXAMPLES`. Note that the examples are actually performed as tests, so you’ll need to run the test for the example to have it built and tested.
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### Author:  [@Hassna87](https://discourse.vtk.org/u/Hassna87)
#### Post date: [June 12, 2021, 11:32am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978/3 "2021-06-12T11:32:53Z")
Thanks a lot for your reply,
Could you please clarify how should I run the test?
I have created a .cxx file and a text file “CMakeLists” both in a source folder, and the in cmake I have made the configuration process.
I would be grateful when you can tell me the steps in details 🙈
many Thanks 😊
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### Author:  [@ben.boeckel](https://discourse.vtk.org/u/ben.boeckel)
#### Post date: [June 13, 2021, 12:53am UTC](https://discourse.vtk.org/t/missing-library-by-configuration-in-cmake-sphere-example-doesnt-work/5978/4 "2021-06-13T00:53:26Z")
You’ll need to build VTK and then run the tests via `ctest -R Example`. Instructions for building VTK are [here](https://gitlab.kitware.com/vtk/vtk/blob/master/Documentation/dev/build.md).