Index: dnstracer.c
--- dnstracer.c.orig	2004-07-08 13:17:59.000000000 +0200
+++ dnstracer.c	2004-10-08 13:46:54.091634581 +0200
@@ -642,7 +642,11 @@
 				    get_resource(rr->type,session,rr->data,0));
 }
 
+#ifdef NOIPV6
+void dump_data(struct sockaddr_in *dest4,void *dest6,struct dnssession *session) {
+#else
 void dump_data(struct sockaddr_in *dest4,struct sockaddr_in6 *dest6,struct dnssession *session) {
+#endif
     struct dnsrr *answerrr;
     struct dnsrr *authorityrr;
     struct dnsrr *additionalrr;
@@ -758,6 +762,7 @@
 	exit(1);
     }
 
+#if defined(AI_NUMERICHOST) && defined(EAI_NODATA)
     if (global_source_address!=NULL) {
 	struct addrinfo hints,*src_res;
 	int error;
@@ -784,6 +789,7 @@
 	    exit(1);
 	}
     }
+#endif
 
     return s;
 }
@@ -1048,6 +1054,25 @@
 
 /*****************************************************************************/
 
+static char *my_strcasestr(const char *s, const char *find)
+{
+    char c, sc;
+    size_t len;
+
+    if ((c = *find++) != 0) {
+        c = tolower((unsigned char)c);
+        len = strlen(find);
+        do {
+            do {
+                if ((sc = *s++) == 0)
+                    return (NULL);
+            } while ((char)tolower((unsigned char)sc) != c);
+        } while (strncasecmp(s, find, len) != 0);
+        s--;
+    }
+    return ((char *)s);
+}
+
 //
 // The core of this program
 //
@@ -1123,7 +1148,11 @@
     // don't have to worry about packets received from previous sessions.
     //
     session=(struct dnssession *)calloc(1,sizeof(struct dnssession));
+#ifdef NOIPV6
+    session->socket=create_socket(AF_INET);
+#else
     session->socket=create_socket(ipv6?AF_INET6:AF_INET);
+#endif
     session->ipv6=ipv6;
     session->server=strdup(server_ip);
     session->host=strdup(host);
@@ -1233,7 +1262,7 @@
 	}
 
 	if (server_authfor!=NULL && strcmp(server_authfor,".")!=0 &&
-	    (unsigned char *)strcasestr(rrauth->domainname_string,server_authfor)!=rrauth->domainname_string+strlen(rrauth->domainname_string)-strlen(server_authfor)) {
+	    (unsigned char *)my_strcasestr(rrauth->domainname_string,server_authfor)!=rrauth->domainname_string+strlen(rrauth->domainname_string)-strlen(server_authfor)) {
 	    if (!refersbackwards++)
 		printf("Refers backwards ");
 	    rrauth=rrauth->next;
@@ -1300,7 +1329,11 @@
 		    struct hostent *h;
 		    char **addr_list=NULL;
 
+#ifndef NOIPV6
 		    h=gethostbyname2(nextserver_name,ip==0?AF_INET:AF_INET6);
+#else
+		    h=gethostbyname(nextserver_name);
+#endif
 		    if (h==NULL) continue;
 
 		    //
@@ -1540,8 +1573,12 @@
 
     {
 	struct hostent *h;
+#ifndef NOIPV6
 	if (((h=gethostbyname2(server_name,AF_INET6))==NULL) &&
 	    ((h=gethostbyname2(server_name,AF_INET))==NULL)) {
+#else
+	if ((h=gethostbyname(server_name))==NULL) {
+#endif
 	    fprintf(stderr,"Cannot find IP address for %s\n",server_name);
 	    return 1;
 	}