taken from forum: http://forums.gentoo.org/viewtopic.php?t=26195&highlight=gideon+kdevelop kdevelop3 has the name gideon for installing it together with kdevelop 2.x! please change the ebuilds so that kdevelop3 not updates kdevelop 2.x! thx sascha
renaming the package is inappropriate they are not changing the name of kdevelop, they've just dubbed one of the releases 'gideon'
fixed, thanks