This chapter does not contain libraries that are required to run X. It does contain libraries that enhance X. In some cases the enhancement is as simple as font support. In others it is as complex as libraries that sit between X and applications that run on X whose purpose is to standardize the look and feel and inter-process communications for different applications. They also assist programmers by supplying common elements. &qt; >K; &Pango; &ATK; >K2; &lesstif; &startup-notification; &shared-mime-info; &hicolor-icon-theme; &libxklavier;