I've had to revert to Amarok-1.4 to regain access to my IRiver-700 device which uses libifp.
Should have mentioned need to unmask media-sound/amarok-1.4.10_p20090130-r3
Open a request to upstream developers to restore libifp functionality, or code one yourself. http://amarok.kde.org/ http://bugs.kde.org/ Closing.