grantlee depends on app-doc/doxygen[-nodot] (if USE=doc). Recent versions of doxygen have a dot USE flag, not a nodot USE flag. Please change the dependency to something like "|| ( <app-doc/doxygen-1.7.6.1[-nodot] >=app-doc/doxygen-1.7.6.1[dot] )" so grantlee[doc] and >=doxygen-1.7.6.1 can be installed on the same system.
*doxygen-1.7.6.1 (14 Feb 2012) 14 Feb 2012; Kacper Kowalik <xarthisius@gentoo.org> +doxygen-1.7.6.1.ebuild, metadata.xml: Version bump: EAPI4, reorder vars, initial support for LINGUAS, use 'dot' instead of 'nodot', add missing dependencies on perl and bison (fixes bug #399349 by bay), respect CC and CXX, call eqmake4 for doxywizard, always use emake, simplify latex+doc logic. Add myself as maintainer.
Sorry for that, I was reckless + 23 Feb 2012; Kacper Kowalik <xarthisius@gentoo.org> grantlee-0.1.8.ebuild, + grantlee-0.1.9.ebuild: + Fix dependency on app-doc/doxygen wrt converting useflags 'nodot' to 'dot'. + Fixes bug 405447 by Marien Zwart <marienz@gentoo.org>