diff -urN tcpdump-3.9.4.orig/tcpdump.c tcpdump-3.9.4/tcpdump.c
--- tcpdump-3.9.4.orig/tcpdump.c	2005-08-23 12:29:41.000000000 +0200
+++ tcpdump-3.9.4/tcpdump.c	2006-02-05 17:52:37.000000000 +0100
@@ -762,20 +762,6 @@
 				error("invalid data link type %s", gndo->ndo_dltname);
 			break;
 
-#if defined(HAVE_PCAP_DEBUG) || defined(HAVE_YYDEBUG)
-		case 'Y':
-			{
-			/* Undocumented flag */
-#ifdef HAVE_PCAP_DEBUG
-			extern int pcap_debug;
-			pcap_debug = 1;
-#else
-			extern int yydebug;
-			yydebug = 1;
-#endif
-			}
-			break;
-#endif
 		case 'Z':
 			if (optarg) {
 				username = strdup(optarg);
