Added linux/types.h for non-glibc systems.
diff --git a/include/libiptc/ipt_kernel_headers.h b/include/libiptc/ipt_kernel_headers.h
index 37b83dc..bc143b1 100644
--- a/include/libiptc/ipt_kernel_headers.h
+++ b/include/libiptc/ipt_kernel_headers.h
@@ -19,5 +19,6 @@
 #include <linux/icmp.h>
 #include <linux/tcp.h>
 #include <linux/udp.h>
+#include <linux/types.h>
 #endif
 #endif