This package contains four tools to ease creating and maintaining patches for pkgsrc: mkpatches, patchdiff, pkgdiff, and pkgvi. pkgdiff compares two files (like diff) and produces an output file that can be used in pkgsrc. mkpatches automatically generates a set of patches, if the original versions of the files had been saved as filename.orig. patchdiff compares a previously existing set of patches with another one created by mkpatches, and outputs any changes. pkgvi makes backup copies if a file is changed, so pkgdiff can be run on it later, generating a patch for the changes made.