Linphone is missing a build DEPEND : checking for ANSI C header files... yes checking for intltool-update... no checking for intltool-merge... no checking for intltool-extract... no configure: error: The intltool scripts were not found. Please install intltool. AFAIK, there is no minimal intltool version check.
the intltool requirement is superfluous. configure script should be fixed. http://sources.gentoo.org/net-voip/linphone/linphone-3.0.0.ebuild?r1=1.1&r2=1.2