x11-apps/sessreg-1.0.1 failed for me with the following error. configure.ac:33: error: must install xorg-macros 1.1 or later before running autoconf/autogen upgrading x11-misc/util-macros to x11-misc/util-macros-1.1.2 solved the problem and sessreg built fine. the sessreg ebuild does not include x11-misc/util-macros in DEPEND
The util-macros dependency is done by x-modular.eclass, but it's certainly not new enough. In any case, sessreg-1.0.2 is in the tree and it doesn't need util-macros for the time being. I've disabled autoreconf on it. Thanks for the find.