app-office/calligra[postgres] blocks the removal of dev-libs/libpqxx-3.1 which in turn blocks GCC 4.7. I haven't found anything in the Calligra documentation that states a particular version for libpqxx. Please review Calligra for the possibility to move to the recent dev-libs/libpqxx-4.0.
+ 02 May 2012; Andreas K. Huettel <dilfridge@gentoo.org> + calligra-2.4.0-r1.ebuild, calligra-2.4.1.ebuild, calligra-2.4.9999.ebuild, + calligra-9999.ebuild: + Relax libpqxx version dependency since it seems to work fine with 4.0, bug + 414277 + Nuff said. :)