Issue installing from source on M2 mac

User Support
1

Hello any interested reader.

I am having problems installing the newest version of OpenMC (had version 0.13.3 and 0.14 previously) on my M2 mac, the issues arise when the command cmake … from the installation procedure is run.

The error output is as follows:

CMake Error at /opt/homebrew/Cellar/cmake/3.30.0/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:233 (message):
Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
Call Stack (most recent call first):
/opt/homebrew/Cellar/cmake/3.30.0/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:603 (_FPHSA_FAILURE_MESSAGE)
/opt/homebrew/Cellar/cmake/3.30.0/share/cmake/Modules/FindOpenMP.cmake:600 (find_package_handle_standard_args)
CMakeLists.txt:84 (find_package)

Has anyone encountered any similar problems?

2

Looks like you don’t have the OpenMP libs installed for C/C++ language.

Try this:

brew install libomp

If this don’t work, try read this:

He has the same problem of you.

3

Hey! Sorry for the late reply!

Manually setting the CC and CXX variables in the terminal to the ones provided by llvm prior to running the cmake … command did the trick!

Thanks for the input! Very appreciated!

1 Like
4

Hi, I have the same problem,

What commands did you use for setting CC and CXX variables in terminal?

Thank toy

5

Hey! Sorry for the late reply i ran

export CXX=/opt/homebrew/opt/llvm/bin/clang++

and

export CC=/opt/homebrew/opt/llvm/bin/clang

not sure if the last one is strictly necessary, but it worked for me!

Good luck!