> Is the second snippet the content of a `guix.scm` you are adding inside
> a git checkout of the project? Is %source-dir defined to the
> checked-out directory?

Hi Wojtek
Yes, sorry for not clarifying that. The second snippet is a guix.scm 
inside the source code of python-cfd-qsense with the python module 
inside src/cfd_qsense.

Cheers,
Reza