It was not a typo. I was referring to the systems used by various linux distributions to manage how they build packages.

e.g. (sorry, I picked an example of openntpd, which only has 1 or 2 patches; other packages have many more!)

  - debian: https://anonscm.debian.org/cgit/collab-maint/openntpd.git/tree/debian/patches
  - arch: https://projects.archlinux.org/svntogit/community.git/tree/trunk?h=packages/openntpd