diff --git a/configure.ac b/configure.ac
index 2607988..a3e37cc 100755
--- a/configure.ac
+++ b/configure.ac
@@ -196,9 +196,9 @@
                  sys/types.h linux/version.h kvm.h netdb.h asm/types.h \
                  libutil.h limits.h])
 
-AC_CHECK_HEADERS([sys/socket.h netinet/in.h net/if_dl.h \
-		 net/netopt.h inet/nd.h net/route.h net/if.h \
-		 net/if_var.h netinet/in_var.h])
+AC_CHECK_HEADERS([sys/socket.h netinet/in_systm.h netinet/in.h \
+		 net/if_dl.hnet/netopt.h inet/nd.h net/route.h 
+		 net/if.h net/if_var.h netinet/in_var.h])
 
 if test "x${enable_ipv6}" = "xyes"; then
 AC_CHECK_HEADERS([netinet6/in6.h netinet/in6_var.h netinet/icmp6.h \