diff -up webkit-1.1.22/JavaScriptCore/wtf/Platform.h.sparc webkit-1.1.22/JavaScriptCore/wtf/Platform.h
--- webkit-1.1.22/JavaScriptCore/wtf/Platform.h.sparc	2010-03-23 08:14:24.378618143 -0400
+++ webkit-1.1.22/JavaScriptCore/wtf/Platform.h	2010-03-23 08:14:29.871502920 -0400
@@ -828,7 +828,10 @@
 #endif
 
 #if !defined(WTF_USE_JSVALUE64) && !defined(WTF_USE_JSVALUE32) && !defined(WTF_USE_JSVALUE32_64)
-#if (CPU(X86_64) && (OS(UNIX) || OS(WINDOWS))) || CPU(IA64) || CPU(ALPHA)
+#if (CPU(X86_64) && (OS(UNIX) || OS(WINDOWS))) \
+    || CPU(IA64)  \
+    || CPU(ALPHA) \
+    || CPU(SPARC64)
 #define WTF_USE_JSVALUE64 1
 #elif CPU(ARM) || CPU(PPC64)
 #define WTF_USE_JSVALUE32 1