It seems media-libs/xpm is long gone and virtual/x11 replaces its functionally. In fact, media-libs/xpm is a just dummy ebuild that depends on virtual/x11. This is the last group of ebuilds that still depends on media-libs/xpm.
Created attachment 77778 [details, diff] xrmap.diff
Fixed: 22 Jan 2006; Krzysiek Pawlik <nelchael__AT__gentoo.org> xrmap-2.29.ebuild, xrmap-2.30.ebuild, xrmap-2.32.ebuild: Fixed DEPEND for modular X.