build failed because of pip install

**Describe the bug**
errors from the quick tests `pip install`:
```
  Attempting uninstall: ruamel.yaml
    Found existing installation: ruamel-yaml 0.15.87
ERROR: Cannot uninstall 'ruamel-yaml'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
```