--- net-snmp-5.5/agent/mibgroup/mibII/tcpTable.c	2009-06-12 21:02:02.000000000 -0500
+++ net-snmp-5.5-libnl/agent/mibgroup/mibII/tcpTable.c	2011-03-17 11:09:33.000000000 -0500
@@ -587,7 +587,13 @@
 		.idiag_states = TCP_ALL,
 	};
 
+#ifdef RTM_GETDCB        
+	/* some distros (RHEL6) have nlmsg_alloc_simple()  */
 	struct nl_msg *nm = nlmsg_alloc_simple(TCPDIAG_GETSOCK, NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST);
+#else  
+	/* some distros (RHEL5) have nlmsg_build_simple()  */
+	struct nl_msg *nm = nlmsg_build_simple(TCPDIAG_GETSOCK, NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST);
+#endif
 	nlmsg_append(nm, &req, sizeof(struct inet_diag_req), 0);
 
 	if (nl_send_auto_complete(nl, nm) < 0) {
@@ -603,7 +609,13 @@
 	int running = 1, len;
 
 	while (running) {
+#ifdef RTM_GETDCB        
+		/* New version of nl_recv */
 		if ((len = nl_recv(nl, &peer, &buf, NULL)) <= 0) {
+#else  
+		/* Old version of nl_recv (RHEL 5 */
+		if ((len = nl_recv(nl, &peer, &buf)) <= 0) {
+#endif
 			DEBUGMSGTL(("mibII/tcpTable", "nl_recv(): %s\n", nl_geterror()));
 			snmp_log(LOG_ERR, "snmpd: nl_recv(): %s\n", nl_geterror());
 			nl_handle_destroy(nl);