diff -ru libnids-1.18.orig/src/checksum.c libnids-1.18/src/checksum.c
--- libnids-1.18.orig/src/checksum.c	2003-09-20 16:40:44.000000000 -0400
+++ libnids-1.18/src/checksum.c	2006-03-14 21:32:36.000000000 -0500
@@ -3,7 +3,8 @@
 #include <netinet/in.h>
 #include <netinet/tcp.h>
 #include <netinet/udp.h>
-
+#undef __i386__
+#undef __i386
 #if ( __i386__ || __i386 )
 // all asm procedures are copied from Linux 2.0.36 and 2.2.10 kernels