conf-update

http://conf-update.berlios.de/

conf-update is a curses based tool for the Gentoo Linux portage system.

conf-update is supposed to be run after merging a new package to see if
there are updates to the configuration files.

conf-update will check all directories in the CONFIG_PROTECT variable. All
config files found in CONFIG_PROTECT_MASK will automatically be updated
for you.