build has docutils-glep as an RDEPEND without an option .. thus required so glep IUSE="glep" is redundant fragment from build IUSE="glep" DEPEND="dev-python/pygments[${PYTHON_USEDEP}]" RDEPEND="${DEPEND} dev-python/docutils-glep[${PYTHON_USEDEP}]"
This is intended to be a backwards compatibility option. I'm going to remove it in a future version, when people already notice the new package being pulled in. @Python, feel free to reopen if you disagree.
<dev-python/docutils-0.10::gentoo was installing GLEP tools only with USE="glep". In dev-python/docutils-0.10::gentoo, dependency on dev-python/docutils-glep should be at least conditional on USE="glep". (No reverse dependencies in gentoo-x86 depend on dev-python/docutils[glep] anyway.)
Ah, sorry, you could have told me straight that I forgot to add the conditional ;). Fixed now.