Disclaimer: this bug has been filed in a semi-automated manner. When emerging the package x11-libs/gtk+-2.24.12, the following elog messages are displayed: * Please install app-text/evince for print preview functionality. * Alternatively, check "gtk-print-preview-command" documentation and * add it to your gtkrc. Such messages should only be displayed when the package is a new install. These situations can be checked in the ebuild as follows: if ! has_version 'x11-libs/gtk+'; then See the tracker bug 440214 for more details.
There is already a check on evince iirc.
if ! has_version "app-text/evince"; then elog "Please install app-text/evince for print preview functionality." elog "Alternatively, check \"gtk-print-preview-command\" documentation and" elog "add it to your gtkrc." fi It's