package get installed under the include folder and not under site-packages

I am trying to install a package (more specifically diplib) with conda install -c conda-forge diplib but for some reason nothing is added to envs/env_name/lib/site-packages. The command runs fine, no warnings/error at all. Everything looks normal but I am still getting 'ModuleNotFoundError: No module named 'diplib' error. However I can find a folder diplib under envs/env_name/include (actually it contains header files).

Does anyone know what has happened please? What is the include folder for? Are we supposed to import packages from it or something is wrong with the conda package and I need to remove (how?) the diplid that appeared under the include directory

This is in Ubuntu (in case it matters)

A quick Google search brought me to the Conda-Forge package called “diplib-feedstock”. This is likely the source of the package you’re trying to install. From the docs of that repo:

Installing diplib from the conda-forge channel can be achieved by adding conda-forge to your channels with:

conda config --add channels conda-forge
conda config --set channel_priority strict

Once the conda-forge channel has been enabled, diplib, diplib-python can be installed with conda:

conda install diplib diplib-python

It looks like the diplib package is the library (with include files as you found out), and diplib-python is the Python package.

The DIPlib project provides an official Python package through PyPI: pip install diplib.