The preferred way to contribute is by creating a [MR (Merge Request)](https://docs.gitlab.com/ee/user/project/merge_requests/#create-new-merge-requests-by-email) here on salsa, but plain patches are also welcome.
Please use [git-buildpackage](http://honk.sigxcpu.org/projects/git-buildpackage/manual-html/gbp.html) with pristine-tar (branch layout: master / upstream / pristine-tar).
