--- a/configure.in.ori	2012-03-01 22:32:17.044450088 +0100
+++ b/configure.in	2012-03-01 22:36:40.995882948 +0100
@@ -331,7 +331,12 @@
 AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS(fcntl.h strings.h sys/ioctl.h sys/time.h syslog.h unistd.h)
-AC_CHECK_HEADERS(linux/netfilter_ipv4.h, , , [#include <limits.h>])
+AC_CHECK_HEADERS(linux/netfilter_ipv4.h, , ,[
+  #include <limits.h>
+  #include <sys/socket.h>
+  #include <linux/in.h>
+  #include <linux/in6.h>
+])
 
 dnl Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST