(en) « GNUstep : nstallation and User’s Guide », (consulté le ) : « Display PostScript and Display GhostScript: GNUstep developers have a free software version of the Display PostScript System called the Display GhostScript System (DGS) that is, in part, based upon the GhostScript program. On systems that have the Adobe Display PostScript System as its native backend, GNUstep will use the Adobe DPS system instead of DGS »
