-/dev/external $MOUNTPOINT_PREFIX/external auto user,noauto,exec,rw,uid=grml,gid=grml 0 0
-/dev/external1 $MOUNTPOINT_PREFIX/external1 auto user,noauto,exec,rw,uid=grml,gid=grml 0 0
-/dev/cdrom $MOUNTPOINT_PREFIX/cdrom auto user,noauto,exec,ro 0 0
-/dev/dvd $MOUNTPOINT_PREFIX/dvd auto user,noauto,exec,ro 0 0
+/dev/external ${MOUNTPOINT_PREFIX}/external auto user,noauto,exec,rw,uid=grml,gid=grml 0 0
+/dev/external1 ${MOUNTPOINT_PREFIX}/external1 auto user,noauto,exec,rw,uid=grml,gid=grml 0 0
+/dev/cdrom ${MOUNTPOINT_PREFIX}/cdrom auto user,noauto,exec,ro 0 0
+/dev/dvd ${MOUNTPOINT_PREFIX}/dvd auto user,noauto,exec,ro 0 0