# Make error on Fedora 35

**URL:** <https://community.freefem.org/t/make-error-on-fedora-35/1558>\
**Category:** FreeFEM installation\
**Created:** [February 27, 2022, 12:50am UTC](https://community.freefem.org/t/make-error-on-fedora-35/1558 "2022-02-27T00:50:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![rubash](https://avatars.discourse-cdn.com/v4/letter/r/a5b964/32.png) [@rubash](https://community.freefem.org/u/rubash)\
**Post date:** [February 27, 2022, 12:50am UTC](https://community.freefem.org/t/make-error-on-fedora-35/1558/1 "2022-02-27T00:50:45Z")

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Cmake finds everything except IPOPT  
Then:  
[1%] Building CXX object src/lglib/CMakeFiles/lglib.dir/lg.tab.cpp.o  
lg.ypp:32:10: fatal error: config.h: No such file or directory

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<div class="post-metadata">

**Author:** ![rubash](https://avatars.discourse-cdn.com/v4/letter/r/a5b964/32.png) [@rubash](https://community.freefem.org/u/rubash)\
**Post date:** [February 28, 2022, 4:40am UTC](https://community.freefem.org/t/make-error-on-fedora-35/1558/2 "2022-02-28T04:40:50Z")

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Installing coin-or-ipopt and coin-or-ipopt-devel using dnf satisfied the IPOPT requirement. Then I gave up on cmake and compiled and installed from source code using configure instructions in the documentation.

I could install FreeFem++ from a Fedora repository, but some functionality was missing, that’s why I needed to install from source code.