diff -up gtk-gnutella-0.96.9/src/lib/endian.h.s390 gtk-gnutella-0.96.9/src/lib/endian.h
--- gtk-gnutella-0.96.9/src/lib/endian.h.s390	2011-04-12 08:29:37.000000000 +0200
+++ gtk-gnutella-0.96.9/src/lib/endian.h	2011-04-12 08:29:55.000000000 +0200
@@ -256,6 +256,7 @@ poke_le64(gpointer p, guint64 v)
 	defined(__ns32k__) || \
 	defined(__powerpc__) || \
 	defined(__ppc__) || \
+	defined(__s390__) || \
 	defined(__sh__) || \
 	defined(__sparc__) || \
 	defined(__sparc) || \