not able to install on Mac..

[Yin169]

ERROR: Could not find a version that satisfies the requirement ViennaPS (from versions: none)
ERROR: No matching distribution found for ViennaPS

[FilipovicLado]

Hi @Yin169 , thanks for reporting this issue.

From the error message, it looks like pip wasn't able to find a compatible build of ViennaPS for your environment.
To help us understand what's going on, could you please provide the following information?

• Your system info (MacOS version and architecture)
• Your Python version
• The exact command you ran to install ViennaPS
• If possible, the output of pip install -vvv ViennaPS --no-cache-dir

This will help us reproduce the issue and point you to the right solution. Thanks!

[saurabhmorarka]

I was having a similar issue as above. I eventually went through the cmake process.
It went through numerous issues on Mac and I used chatgpt to fix it. Almost 10-15 iterations after it finally worked. Fixes included 1. not using clang on mac and moving to gcc instead. 2. Then OpenMP installation followed by its 3. explicit link (and gcc link) in the cmake command were the things that needed fixing ..

[GeraldEbberinkSaxion]

I also found the same problem.

See the output of your pip command in the attached file

test.txt

[tobre1]

The error means pip can’t find a wheel for your setup. Common causes could be unsupported Python/OS/arch, or an outdated pip.
Please share:

• OS + CPU arch (e.g., macOS 14, arm64 or x86_64)
• Python and pip versions: python -V && pip -V
• Exact install command

---

If no wheels are available you'll have to build ViennaPS from source. Here are the steps to do so:

1. Install Xcode Developer Tools

The Xcode Command Line Tools are needed for compilers and basic build utilities.
Run:

xcode-select --install

This will open a dialog to install Apple’s developer tools if they are not already installed.

2. Install dependencies via Homebrew

ViennaPS requires several libraries that are easiest to get through Homebrew.
Make sure you have Homebrew installed from [brew.sh](https://brew.sh).
Then install the required packages:

brew install cmake libomp vtk embree

3. Create and activate a Python virtual environment

It is recommended to build ViennaPS in an isolated environment.

python3 -m venv .venv
source .venv/bin/activate
python -m pip install -U pip wheel setuptools

• This creates a .venv folder in your current directory.
• Upgrading pip, wheel, and setuptools avoids most build errors.

4. Build and install ViennaLS (dependency of ViennaPS)

ViennaPS depends on ViennaLS, which must be installed first.

git clone https://github.com/ViennaTools/ViennaLS.git
cd ViennaLS
pip install .
cd ..

This builds ViennaLS from source and installs the Python bindings into your virtual environment.

5. Build and install ViennaPS

Now you can build ViennaPS itself.

git clone https://github.com/ViennaTools/ViennaPS.git
cd ViennaPS
pip install .

[GeraldEbberinkSaxion]

OS: MaxcOS 15.6.1 (24G90)
CPU: arm64 (apple M2 to be specific)
Python version: 3.13.0
pip version: 24.3.1
install command: pip install -vvv ViennaPS --no-cache-dir

I'll try to build from source.

[GeraldEbberinkSaxion]

Building from source it fails at:
CMake Error at /opt/homebrew/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:227 (message):
Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES)
Call Stack (most recent call first):
/opt/homebrew/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:591 (_FPHSA_FAILURE_MESSAGE)
/opt/homebrew/share/cmake/Modules/FindOpenMP.cmake:652 (find_package_handle_standard_args)
build/_deps/viennacore-src/CMakeLists.txt:58 (find_package)

For both ViennaLS and ViennaPS.
I'll investigate further

[GeraldEbberinkSaxion]

Building from source it fails at: CMake Error at /opt/homebrew/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:227 (message): Could NOT find OpenMP_C (missing: OpenMP_C_FLAGS OpenMP_C_LIB_NAMES) Call Stack (most recent call first): /opt/homebrew/share/cmake/Modules/FindPackageHandleStandardArgs.cmake:591 (_FPHSA_FAILURE_MESSAGE) /opt/homebrew/share/cmake/Modules/FindOpenMP.cmake:652 (find_package_handle_standard_args) build/_deps/viennacore-src/CMakeLists.txt:58 (find_package)

For both ViennaLS and ViennaPS. I'll investigate further

It needed three extra exports and the installation of ninja.
So:

brew install ninja 

and

export OpenMP_ROOT="$(brew --prefix)/opt/libomp"
export LDFLAGS="-L$(brew --prefix)/opt/libomp/lib"
export CPPFLAGS="-I$(brew --prefix)/opt/libomp/include"

it could be that only one or two of the export are needed. But for me it worked when I had all three in.