Import named "flib" not found locally. Trying to resolve it at the PyPI server.

I have a project with my own lib **flib**. I've already add lib **flib** to python by set envs:

```
export PYTHONNOUSERSITE=0
export PYTHONUSERBASE=/Users/fred/Fred/workspace/python/fred-py-app3
```

**fred-py-app3** is my project root path.

I get the warning:

```
WARNING: Import named "flib" not found locally. Trying to resolve it at the PyPI server.
WARNING: Import named "flib" was resolved to "flib:0.9.2" package (https://pypi.org/project/flib/).
```

Start by reproducing the warning in pipreqs with the reported PYTHONNOUSERSITE and PYTHONUSERBASE settings and a local library named flib. Trace the import-resolution path that decides whether flib is available locally. Done means the local flib is recognized without resolving to the unrelated PyPI package.

Written by the indexing model from the issue text.