--- Sysctl.xs.orig	2013-12-26 15:39:24.130607201 -0600
+++ Sysctl.xs	2013-12-26 15:41:09.233611186 -0600
@@ -537,6 +537,7 @@
         /* the remaining custom formats are for opaque mibs */
         case FMT_MBSTAT: {
             HV *c = (HV *)sv_2mortal((SV *)newHV());
+#if __FreeBSD_version < 1000037
             struct mbstat *inf = (struct mbstat *)buf;
             RETVAL = newRV((SV *)c);
             hv_store(c, "copymfail",      9, newSVuv(inf->m_mcfail), 0);
@@ -563,6 +564,7 @@
             hv_store(c, "sfallocwait",   11, newSVuv(inf->sf_allocwait), 0);
             hv_store(c, "sfiocnt",        7, newSVuv(inf->sf_iocnt), 0);
 #endif
+#endif
             break;
         }
         case FMT_NTPTIMEVAL: {