NixOS/nixpkgs — pull request #174 by MarcWeber (2012-10-25 04:08:54+00:00)
Title: 2.6-2 moved to 2.6-3, so patches were not found

Maybe some new important patches can be found here?
http://patch-tracker.debian.org/package/plotutils/2.6-3

upstream source didn't change