Created attachment 344668 [details] build.log Currently the firefox-20.0.ebuild lists ">=dev-libs/nss-3.14.1" as a required nss version in its RDEPEND. However Firefox actually requires nss-3.14.3 as seen in a configure log: checking for __attribute__((always_inline))... yes checking for __attribute__((malloc))... yes checking for __attribute__((warn_unused_result))... yes checking for LC_MESSAGES... yes checking for localeconv... yes checking for nspr-config... /usr/bin/nspr-config checking for NSPR - version >= 4.9.4... yes checking for event.h... yes checking for event_init in -levent... yes checking for nss-config... /usr/bin/nss-config checking for NSS - version >= 3.14.3... no configure: error: you don't have NSS installed or your version is too old *** Fix above errors and then restart with "make -f client.mk build" Portage is thus unable to track the dependency, allowing firefox package to ungracefully fail to build. nss version in RDEPEND of the firefox-20.0 ebuild needs to be bumped.
20.0.1 has landed in cvs which is fixed, thanks for reporting.