gnome-doc-utils

Gnome-doc-utils is a collection of documentation utilities for the Gnome project. Notably, it contains utilities for building documentation and all auxiliary files in your source tree, and it contains the DocBook XSLT stylesheets that were once distributed with Yelp. Starting with Gnome 2.8, Yelp will require gnome-doc-utils for the XSLT. Gnome documentation utilities.