Installation build wheel error

[jhogg11]

Hi, I wanted to try this package to hopefully get a speed improvement over similar Python libraries and am running into an issue with installation. I followed the steps from the README file:

git clone https://github.com/mlysy/kalmantv
cd kalmantv
pip install .

And am getting this error on the install command:

DEPRECATION: A future pip version will change local packages to be built in-place without first copying to a temporary directory. We recommend you use --use-feature=in-tree-build to test your packages with this new behavior before it becomes the default.
   pip 21.3 will remove support for this functionality. You can find discussion regarding this at https://github.com/pypa/pip/issues/7555.
Processing /Users/me/Downloads/kalmantv
  Installing build dependencies ... done
  Getting requirements to build wheel ... error
  ERROR: Command errored out with exit status 1:
   command: /Users/me/.pyenv/versions/3.8.3/bin/python3.8 /Users/me/.pyenv/versions/3.8.3/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /var/folders/g1/0pjsd_bs24jgccrd6g0lzfvc0000gn/T/tmpxmrdlgnk
       cwd: /Users/me/Downloads/kalmantv
  Complete output (6 lines):
  running egg_info
  writing kalmantv.egg-info/PKG-INFO
  writing dependency_links to kalmantv.egg-info/dependency_links.txt
  writing requirements to kalmantv.egg-info/requires.txt
  writing top-level names to kalmantv.egg-info/top_level.txt
  error: package directory 'eigen-3.3.7' does not exist
  ----------------------------------------
WARNING: Discarding file:///Users/me/Downloads/kalmantv. Command errored out with exit status 1: /Users/me/.pyenv/versions/3.8.3/bin/python3.8 /Users/me/.pyenv/versions/3.8.3/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /var/folders/g1/0pjsd_bs24jgccrd6g0lzfvc0000gn/T/tmpxmrdlgnk Check the logs for full command output.
ERROR: Command errored out with exit status 1: /Users/me/.pyenv/versions/3.8.3/bin/python3.8 /Users/me/.pyenv/versions/3.8.3/lib/python3.8/site-packages/pip/_vendor/pep517/in_process/_in_process.py get_requires_for_build_wheel /var/folders/g1/0pjsd_bs24jgccrd6g0lzfvc0000gn/T/tmpxmrdlgnk Check the logs for full command output.

I tried adding --use-feature=in-tree-build from the deprecation warning but still got the error (without the initial warning).

I saw a number of suggestions such as using pip install --upgrade pip setuptools wheel, but nothing is doing the trick. I would guess that this has a simple fix but this stuff is a little over my head and I don't want to break anything else. Any ideas?

[WillDaSilva]

Seems like the installation instructions are missing instructions to download the Eigen library, and make it available under the project's root directory under the name eigen-3.3.7.

[mlysy]

This is embarrassing...we went through all the trouble of creating eigenpip, a wrapper to a recent version of Eigen on PyPi, so that users wouldn't need to install Eigen themselves. But then we forgot to update kalmantv accordingly! In any case, it's fixed now. By the way, if you have installed a newer version of Eigen, you can install eigenpip to link to it instead of the version it comes packaged with.