http://sources.gentoo.org/viewcvs.py/gentoo-x86/x11-libs/openmotif/openmotif-2.2.3-r9.ebuild?r1=1.2&r2=1.3 looks fishy. >=sys-devel/autoconf-2.5 is also fulfilled by autoconf-2.13, which is probably not what was meant. Correct would be >=sys-devel/autoconf-2.50 or >=sys-devel/autoconf-2.59.
I removed the version, autoconf is in system and thus should not be DEPed on anyway. Well without version number it referrs to the latest version, so it is fine. Thanks