Install OpenMC from source on MacOS with Conda

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Hi everyone,

That’s quite a long time time I struggle with the creation of a conda environment to compile OpenMC on MacOs without utilizing brew. I don’t like brew because I must work with a lot of different environments & code and it creates issues with conda.

So here is how I did it, if it can help some of you:

conda create -n openmc-dev compilers=1.9.0 cmake hdf5 python libpng
git clone --recurse-submodules https://github.com/openmc-dev/openmc.git
cd openmc
mkdir build
cd build
cmake -DCMAKE_INSTALL_PREFIX=/path/to/conda/envs/openmc-dev ..
make
make install
cd ..
python -m pip install .

On more recent versions of compilers, clang is version 19 and is not able to pass cmake compilation checks.

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