+netccitt/ccitt_proto.c optional ccitt
+netccitt/hd_debug.c optional ccitt
+netccitt/hd_input.c optional ccitt
+netccitt/hd_output.c optional ccitt
+netccitt/hd_subr.c optional ccitt
+netccitt/hd_timer.c optional ccitt
+netccitt/if_x25subr.c optional ccitt
+netccitt/pk_acct.c optional ccitt
+netccitt/pk_debug.c optional ccitt
+netccitt/pk_input.c optional ccitt
+netccitt/pk_output.c optional ccitt
+netccitt/pk_subr.c optional ccitt
+netccitt/pk_timer.c optional ccitt
+netccitt/pk_usrreq.c optional ccitt