RDEPEND="!<=sys-apps/coldplug" <= is illegal if you aren't specifying a -version. This should read either !sys-apps/coldplug or !<=sys-apps/coldplug-1.23 . Portage doesn't visibly care in most places, but various other tools are stricter. 'Fraid I can't commit a fix for this myself...
Will be fixed in 090 release.