Hi Philippe, Philippe SWARTVAGHER skribis: > We already have `--with-branch=`, `with-commit=`, ... An additional > option could be `--with-patch=package=add-extra-feature.patch` which > would apply the patch file `add-extra-feature.patch` located in the my > current directory to the sources of `package` before Guix starts > building `package`. Good idea! The patch below does that. Feedback welcome. :-) Ludo’.