# endif
#endif /* EFSYS_OPT_FILTER */
+#if (EFSYS_OPT_HUNTINGTON || EFSYS_OPT_MEDFORD)
+# if !EFSYS_OPT_FILTER
+# error "HUNTINGTON or MEDFORD requires FILTER"
+# endif
+#endif /* EFSYS_OPT_HUNTINGTON */
+
#ifdef EFSYS_OPT_MAC_FALCON_GMAC
# error "MAC_FALCON_GMAC is obsolete and is not supported."
#endif