local backend
    if use jack ; then
       backend="jack"
    elif use alsa ; then1
        backend="alsa"
    elif use oss ; then
        backend="oss"
    else
        einfo "One of the following USE flags is needed: jack, alsa or oss"
        die "One of the following USE flags is needed: jack, alsa or oss"
    fi
    einfo "Compiling against ${backend}"
    emake "linux-${backend}" || die "emake failed"