When xorg-server is built with the "dmx" USE-flag, it has both a build-time and a run-time dependency on libXrender. Reproducible: Always Steps to Reproduce: 1. Either remove libXrender from your system (this will break things), or try to build xorg-server in a chroot. Actual Results: checking for DMXMODULES... no checking whether to build Xdmx DDX... yes configure: error: Xdmx build explicitly requested, but required modules not found. Expected Results: The ebuild should finish successfully. Completing the ebuild with libXrender in place, removing libXrender, then running revdep-rebuild reveals the run-time dependency. libXrender is typically pulled in by applications or application frameworks, or some of the X utilities (e.g. KDE, GNOME, Firefox, Thunderbird, xterm, xrandr), and so reproducing this build bug may be hard in anything but a minimal chroot. To workaround, "emerge -1 libXrender". You'll probably install some apps later that will have an explicit dependency on it.
Created attachment 292727 [details] build.log
Created attachment 292729 [details] environment
Created attachment 292731 [details] info
Fixed in CVS.