Installation error : "Protobuf compiler not found"

[xurei]

There is a missing step in the install process in the README.

...
      -- Found PythonLibs: /usr/lib/x86_64-linux-gnu/libpython3.12.so (found version "3.12.7")
      Generated: /tmp/pip-install-ona22hsx/onnx_89c6a67bcba64053a39666433b6cab5d/.setuptools-cmake-build/onnx/onnx-ml.proto
      CMake Error at CMakeLists.txt:303 (message):
        Protobuf compiler not found
      Call Stack (most recent call first):
        CMakeLists.txt:334 (relative_protobuf_generate_cpp)
...

To solve this, I used sudo apt install protobuf-compiler on Ubuntu 24.10.

Hope this will help someone until the README is fixed.

I still have issues installing it during the linking process of onnx. If I find the cause, I'll create another issue for this.

[ZhangGe6]

@xurei Are you trying to build wheel from the source code? I built on my Windows machine simply by "python -m build" and all things went well. Surprises can happen given to different platforms/environment setups.

Just curious, why not use the pre-built wheel from PyPI directly (by pip install onnx-modifier)? Is there any issue encountered?

[xurei]

I'm on Linux, and yes, The issue happened when I tried to install with pip install onnx-modifier.

I'm not very experienced with python, but AFAIK it is not able to install software globally (i.e. with apt). Apparently, ONNX depends on it, so it was failing.

[rwfsmith]

I'm getting the same thing on Windows, so I did this:

pip install onnx pip install onnx_tool pip install flask

then it worked.