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dfki-ric / phobos

An add-on for Blender allowing to create URDF, SDF and SMURF robot models in a WYSIWYG environment.

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problem when installing dependency `lxml`: `Python.h` file not found

zhuoqun-chen opened this issue · comments

commented

Describe the bug

When using the provided install_requirements.py to install the dependencies, one of the optional depency lxml failed to be installed because Python.h file is not found when building the wheel:

image

To Reproduce

Steps to reproduce the behavior:

  1. download install_requirements.py and go to the path where this script is downloaded
  2. execute $YOUR_BLENDER_EXECUTABLE -b —python install_requirements.py
  3. press y when prompted with the Do you want to proceed? [y/n] question
  4. the bug occurs saying that lxml wheel failed to be built

Expected behavior

The optional dependency lxml can also be installed.

Screenshots

See the description section above.

Desktop (please complete the following information)

  • OS: MacOS
  • Version Ventura 13.4 running on Apple M1 Pro

Additional context (Solution)

This issue can be viewed as a reference in case someone in the future has the same problem as me.
This problem can be fixed by following these steps:

  1. find the python version your blender is using (3.10.12 in my case)
  2. use conda create an environment with the same python version as above, e.g., conda create -n blender_ws python=3.10.12)
  3. confirm that there is Python.h located inside ~/miniconda3/envs/blender_ws/include/python3.10/Python.h
  4. go into the terminal and add environment path export C_INCLUDE_PATH=“~/miniconda3/envs/blender_ws/include/python3.10”
  5. execute the install script again within the same terminal: $YOUR_BLENDER_EXECUTABLE -b —python install_requirements.py
  6. lxml should be successfully installed
commented

Thanks for reporting this and contributing a possible solution.

It seems blender on Mac is not properly installing python-dev, so it seems required to install this manually. Please not this similar issue and solution here on Linux: https://blender.stackexchange.com/a/107381

Also lxml is an optional dependency. If it's not available for you you can comment it from the requirements then the plain xml of python should be used.

commented

I consider this as solved