qgis 1.8 requires libspatialindex (see bug #421093) sci-libs / libspatialindex is already in the science overlay, maintained by sci-geosciences@gentoo.org http://git.overlays.gentoo.org/gitweb/?p=proj/sci.git;a=tree;f=sci-libs/libspatialindex so it just needs to be imported to portage proper thanks
+*libspatialindex-1.8.0 (11 Feb 2013) + + 11 Feb 2013; Julian Ospald <hasufell@gentoo.org> + +libspatialindex-1.8.0.ebuild, +files/libspatialindex-1.8.0-QA.patch, + +metadata.xml: + initial import wrt #413367