Guix makes a big deal out of being fully reproducible. It is possible to pin versions, you basically state "I want package X while the guix repository is at com

Guix makes a big deal out of being fully reproducible. It is possible to pin versions, you basically state "I want package X while the guix repository is at commit hash Y". Every dependency of the package will be built and made available at the appropriate version and everything will work out. I used this to roll back fprintd when it broke due to a broken dependency and it worked without problems.