Created attachment 466836 [details] build.log.gz checking for XEPHYR... no configure: error: Package requirements (xau xdmcp xcb xcb-shape xcb-render xcb-r enderutil xcb-aux xcb-image xcb-icccm xcb-shm xcb-keysyms xcb-randr xcb-xkb xcb- xv libdrm >= 2.3.1 xcb-glx xcb-xf86dri > 1.6) were not met: No package 'xcb-xkb' found Enabling USE=xkb on libxcb allowed it to compile.
Thank you for the report! Fixed by commit b37e2e6c6a4784712c0d79d6ec273b11c4476c9b Author: Matt Turner <mattst88@gentoo.org> Date: Sun Mar 12 19:05:24 2017 -0700 x11-base/xorg-server: Depend on libxcb[xkb] for USE=xephyr. Upstream commit 9c88cb9b05911 began requiring it. Bug: https://bugs.gentoo.org/612442