diff -up gmp-5.0.1/configure.in.pom gmp-5.0.1/configure.in
--- gmp-5.0.1/configure.in.pom	2010-02-06 13:43:13.000000000 +0100
+++ gmp-5.0.1/configure.in	2010-05-24 13:36:37.000000000 +0200
@@ -1095,6 +1095,11 @@ case $host in
     ;;
 
 
+  s390x-*-*)
+    gcc_cflags="-g -O2 $fomit_frame_pointer"
+    path="s390x"
+    #extra_functions="udiv_w_sdiv"
+    ;;
   # IBM s/370 and similar
   [s3[6-9]0*-*-*])
     gcc_cflags="$gcc_cflags $fomit_frame_pointer"
diff -up gmp-5.0.1/mpn/s390/gmp-mparam.h.pom gmp-5.0.1/mpn/s390/gmp-mparam.h
--- gmp-5.0.1/mpn/s390/gmp-mparam.h.pom	2010-02-06 13:43:14.000000000 +0100
+++ gmp-5.0.1/mpn/s390/gmp-mparam.h	2010-05-24 13:39:21.000000000 +0200
@@ -18,7 +18,8 @@ You should have received a copy of the G
 along with the GNU MP Library.  If not, see http://www.gnu.org/licenses/.  */
 
 
-/* GMP_LIMB_BITS etc generated by configure */
+#define BITS_PER_MP_LIMB 32
+#define BYTES_PER_MP_LIMB 4
 
 
 /* Generated by tuneup.c, 2001-12-03, gcc 2.95 */