I have a package that depends on control but I have trouble testing it in Travis-CI due to the following error when running pip install control:

ImportError: Unable to import git_revision. Try removing control/version.py and the build directory before building.

The full log is here: https://travis-ci.org/kdavies4/ModelicaRes/jobs/35359894.

Do you know how to fix this? It seems that control.version can't be imported until the control package is installed, which requires control.version. A catch-22?