diff -up webkitgtk-2.4.5/Source/WTF/wtf/dtoa/utils.h.aarch64 webkitgtk-2.4.5/Source/WTF/wtf/dtoa/utils.h
--- webkitgtk-2.4.5/Source/WTF/wtf/dtoa/utils.h.aarch64	2014-09-02 11:39:15.782812173 +0200
+++ webkitgtk-2.4.5/Source/WTF/wtf/dtoa/utils.h	2014-09-02 11:41:23.022637099 +0200
@@ -49,7 +49,7 @@
 defined(__ARMEL__) || \
 defined(_MIPS_ARCH_MIPS32R2)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
-#elif CPU(MIPS) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || OS(WINCE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA)
+#elif CPU(MIPS) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || OS(WINCE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(ALPHA) || CPU(AARCH64) || CPU(HPPA)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)
 #if defined(_WIN32)
diff -up webkitgtk-2.4.5/Source/WTF/wtf/Platform.h.aarch64 webkitgtk-2.4.5/Source/WTF/wtf/Platform.h
--- webkitgtk-2.4.5/Source/WTF/wtf/Platform.h.aarch64	2014-08-25 14:50:32.000000000 +0200
+++ webkitgtk-2.4.5/Source/WTF/wtf/Platform.h	2014-09-02 11:40:40.925033307 +0200
@@ -331,6 +331,14 @@
 #define WTF_CPU_NEEDS_ALIGNED_ACCESS 1
 #endif
 
+/* CPU(AARCH64) - AArch64 */
+#if defined(__aarch64__)
+#define WTF_CPU_AARCH64 1
+#if defined(__AARCH64BE__)
+#define WTF_CPU_BIG_ENDIAN 1
+#endif
+#endif
+
 /* ==== OS() - underlying operating system; only to be used for mandated low-level services like 
    virtual memory, not to choose a GUI toolkit ==== */
 
@@ -656,7 +664,8 @@
     || CPU(ARM64) \
     || CPU(S390X) \
     || CPU(PPC64) \
-    || CPU(PPC64LE)
+    || CPU(PPC64LE) \
+    || CPU(AARCH64)
 #define WTF_USE_JSVALUE64 1
 #else
 #define WTF_USE_JSVALUE32_64 1