# Installation ERROR occured

**URL:** <https://gromacs.bioexcel.eu/t/installation-error-occured/6370>\
**Category:** User discussions\
**Tags:** installation-error\
**Created:** [May 10, 2023, 5:30pm UTC](https://gromacs.bioexcel.eu/t/installation-error-occured/6370 "2023-05-10T17:30:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![tuntunboy](https://avatars.discourse-cdn.com/v4/letter/t/97f17d/32.png) [@tuntunboy](https://gromacs.bioexcel.eu/u/tuntunboy)\
**Post date:** [May 10, 2023, 5:30pm UTC](https://gromacs.bioexcel.eu/t/installation-error-occured/6370/1 "2023-05-10T17:30:27Z")

</div>

GROMACS version:2023.1  
GROMACS modification: No  
Here post your question

Dear Gromacs Users:

Hi. I was trying to install gromacs on my PC, but installation error occured.  
My environments are  
Windows 10  
Ryzen 3950x

Firstly I installed FFTW3 into my PC and then i followed installation guideline ([https://manual.gromacs.org/current/install-guide/index.html](https://manual.gromacs.org/current/install-guide/index.html))

However, the trouble rised lik bellow

– Looking for fftwf\_plan\_many\_dft\_c2r in C:/fftw3 - not found  
CMake Error at cmake/FindFFTW.cmake:104 (message):  
Could not find fftwf\_plan\_many\_[r2c|c2r] in C:/fftw3, take a look at the  
error message in  
C:/Users/tuntu/gromacs-2023.1/build/CMakeFiles/CMakeError.log to find out  
what went wrong. If you are using a static lib (.a) make sure you have  
specified all dependencies of fftw3f in FFTWF\_LIBRARY by hand (e.g.  
-DFFTWF\_LIBRARY=‘/path/to/libfftw3f.so;/path/to/libm.so’) !  
Call Stack (most recent call first):  
cmake/gmxManageFFTLibraries.cmake:64 (find\_package)  
CMakeLists.txt:843 (include)

Please show me how to solve it.

Thank you

---

<div class="post-metadata">

**Author:** ![tuntunboy](https://avatars.discourse-cdn.com/v4/letter/t/97f17d/32.png) [@tuntunboy](https://gromacs.bioexcel.eu/u/tuntunboy)\
**Post date:** [May 10, 2023, 5:31pm UTC](https://gromacs.bioexcel.eu/t/installation-error-occured/6370/2 "2023-05-10T17:31:39Z")

</div>

P.S.

I designated the PATH to the fftw3 location.  
AS  
cmake … -DREGRESSIONTEST\_DOWNLOAD=ON -DGMX\_GPU=CUDA -DFFTWF\_LIBRARY=“C:\fftw3”