diff -up kdelibs-4.7.2/kjs/wtf/Platform.h.me kdelibs-4.7.2/kjs/wtf/Platform.h
--- kdelibs-4.7.2/kjs/wtf/Platform.h.me	2011-12-06 10:10:08.372356038 -0500
+++ kdelibs-4.7.2/kjs/wtf/Platform.h	2011-12-06 10:48:51.962357831 -0500
@@ -97,6 +97,18 @@
 
 /* CPU */
 
+/* PLATFORM(S390X) - S390X 64-bit */                                                                                  
+#if defined(__s390x__)                                                                                          
+#define WTF_PLATFORM_S390X 1                                                                                         
+#define WTF_PLATFORM_BIG_ENDIAN 1                                                                                    
+#endif                                                                                                          
+                                                                                                                
+/* PLATFORM(S390) - S390 32-bit */                                                                                   
+#if defined(__s390__)                                                                                           
+#define WTF_PLATFORM_S390 1                                                                                          
+#define WTF_PLATFORM_BIG_ENDIAN 1                                                                                    
+#endif                                                                                                          
+
 /* PLATFORM(PPC) */
 #if   defined(__ppc__)     \
    || defined(__PPC__)     \