I have an ordinary library, presented in pypi. Inside it, there is a tricky way to resolve names in the modules that we import. If I install it to Python folder, in a common way, PyCharm resolves it, builds a skeleton and I get the auto-completion for it. But in our project, we are holding used libraries in a project folder and PyCHarm doesn't read and process the library. For this, I got the "unresolved references" inspection raising, and the red wave-line.
How can I make PyCharm resolve a library in a project folder?