iproute2 + iptables 1.4.0 not working with you?
Solution

diff -Naur iproute2-git/tc/m_ipt.c iproute2-new/tc/m_ipt.c
--- iproute2-git/tc/m_ipt.c     2007-12-24 16:59:19.000000000 +0200
+++ iproute2-new/tc/m_ipt.c     2007-12-24 17:07:11.000000000 +0200
@@ -69,6 +69,27 @@
 }

 void
+xtables_register_target(struct iptables_target *me)
+{
+/*      fprintf(stderr, "\nDummy register_target %s \n", me->name);
+*/
+       me->next = t_list;
+       t_list = me;
+
+}
+
+
+void
+xtables_register_match(struct iptables_target *me)
+{
+/*      fprintf(stderr, "\nDummy register_target %s \n", me->name);
+*/
+       me->next = t_list;
+       t_list = me;
+
+}
+
+void
 exit_tryhelp(int status)
 {
        fprintf(stderr, "Try `%s -h' or '%s --help' for more information.\n",
@@ -217,7 +238,7 @@
        char *error;
        char *new_name, *lname;
        struct iptables_target *m;
-       char path[strlen(lib_dir) + sizeof ("/libipt_.so") + strlen(name)];
+       char path[strlen(lib_dir) + sizeof ("/libxt_.so") + strlen(name)];

        new_name = malloc(strlen(name) + 1);
        lname = malloc(strlen(name) + 1);
@@ -248,10 +269,11 @@
                }
        }

-       sprintf(path,  "%s/libipt_%s.so",lib_dir, new_name);
+       sprintf(path,  "%s/libxt_%s.so",lib_dir, new_name);
        handle = dlopen(path, RTLD_LAZY);
        if (!handle) {
-               sprintf(path, lib_dir, "/libipt_%s.so", lname);
+               fputs(dlerror(), stderr);
+               sprintf(path, "%s/libxt_%s.so", lib_dir , lname);
                handle = dlopen(path, RTLD_LAZY);
                if (!handle) {
                        fputs(dlerror(), stderr);