Note that DPS is now obsolete.
At the time when I started this project, there was no decent rendering interface for X11 other than DPS.
Since then, there has been a large amount of work on a simple and clean X server extension, Xrender, which provides the basis for just such an interface.
Rendering libraries that are being built above Xrender include Xft, a font rendering library built on FreeType; Cairo, a geometry rendering library that provides PostScript-like rendering primitives but with intrinsic support for Porter-Duff compositing (transparency); Pango, a high-level typesetting library.
If your application uses DPS, please consider porting it to the above libraries. See the DPS extension site for more details
The DPS software is included and built by default (except as noted below) in the X.Org X11R6.8 release series. The software will be included, but not built unless specifically configured by the builder, in the X.Org X11R6.9 release series. At this time, X.Org does not plan to include any of the DPS software in X11R7.0 or later releases.