# Installing CHAP tool in combination with GROMACS

**URL:** <https://gromacs.bioexcel.eu/t/installing-chap-tool-in-combination-with-gromacs/490>\
**Category:** User discussions\
**Created:** [July 14, 2020, 9:52am UTC](https://gromacs.bioexcel.eu/t/installing-chap-tool-in-combination-with-gromacs/490 "2020-07-14T09:52:20Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Yogesh](https://avatars.discourse-cdn.com/v4/letter/y/49beb7/32.png) [@Yogesh](https://gromacs.bioexcel.eu/u/Yogesh)\
**Post date:** [July 14, 2020, 9:52am UTC](https://gromacs.bioexcel.eu/t/installing-chap-tool-in-combination-with-gromacs/490/1 "2020-07-14T09:52:20Z")

</div>

GROMACS version:  
GROMACS modification: Yes/No  
Here post your question:  
Hi  
i want to do some analysis on membrane bound protein. i want to use CHAP tool for trajactory analysis. But **while installing CHAP i am getting error**

CMake Error at cmake/Modules/FindGROMACS/FindGROMACS.cmake:71 (find\_package):  
Could not find a configuration file for package “GROMACS” that is compatible with requested version “2016”.

The following configuration files were considered but not accepted:

```
/usr/local/gromacs/share/cmake/gromacs/gromacs-config.cmake, version: 5.1

```

**The user manual for CHAP installation says**  
" The `libgromacs` library of the [Gromacs](http://www.gromacs.org/) molecular dynamics engine in version 2016 or higher. Comprehensive installation instructions for Gromacs can be found [here](http://manual.gromacs.org/documentation/). Please note that for using Gromacs as a library, the underlying FFTW libray may **not** be installed automatically, i.e. you need to set `-DGMX_BUILD_OWN_FFTW=OFF` when running CMake during the Gromacs installation."

**my earlier gromacs installation** used this statement “cmake … -DGMX\_BUILD\_OWN\_FFTW=ON -DREGRESSIONTEST\_DOWNLOAD=ON”  
Do i need to reinstall gromacs with OFF to troubleshoot this error?