As already reported upstream ( http://sourceforge.net/tracker/index.php?func=detail&aid=1564785&group_id=160565&atid=816357 ) curlftpfs-0.8 doesn't emerge when the newest available sys-fs/fuse is installed (2.6.0_rc1). Using 2.6.0_pre2 it works fine. Solution: set ACCEPT_KEYWORDS="~amd64" in fuse-2.6.0_rc1.ebuild
thank you! I fixed it with the upstream patch