Index: webkitgtk/Source/WTF/wtf/Platform.h
===================================================================
--- webkitgtk.orig/Source/WTF/wtf/Platform.h
+++ webkitgtk/Source/WTF/wtf/Platform.h
@@ -80,16 +80,20 @@
 #endif
 #endif
 
-/* CPU(MIPS) - MIPS 32-bit */
-/* Note: Only O32 ABI is tested, so we enable it for O32 ABI for now.  */
-#if (defined(mips) || defined(__mips__) || defined(MIPS) || defined(_MIPS_)) \
-    && defined(_ABIO32)
+/* CPU(MIPS) - MIPS 32-bit and 64-bit */
+#if (defined(mips) || defined(__mips__) || defined(MIPS) || defined(_MIPS_) \
+    || defined(__mips64))
+#if defined(__mips64)
+#define WTF_CPU_MIPS64 1
+#define WTF_MIPS_ARCH __mips64
+#else
 #define WTF_CPU_MIPS 1
+#define WTF_MIPS_ARCH __mips
+#endif
 #if defined(__MIPSEB__)
 #define WTF_CPU_BIG_ENDIAN 1
 #endif
 #define WTF_MIPS_PIC (defined __PIC__)
-#define WTF_MIPS_ARCH __mips
 #define WTF_MIPS_ISA(v) (defined WTF_MIPS_ARCH && WTF_MIPS_ARCH == v)
 #define WTF_MIPS_ISA_AT_LEAST(v) (defined WTF_MIPS_ARCH && WTF_MIPS_ARCH >= v)
 #define WTF_MIPS_ARCH_REV __mips_isa_rev
@@ -685,6 +689,7 @@
     || CPU(ARM64) \
     || CPU(SPARC64) \
     || CPU(S390X) \
+    || CPU(MIPS64) \
     || CPU(PPC64) \
     || CPU(PPC64LE)
 #define WTF_USE_JSVALUE64 1
Index: webkitgtk/Source/WTF/wtf/dtoa/utils.h
===================================================================
--- webkitgtk.orig/Source/WTF/wtf/dtoa/utils.h
+++ webkitgtk/Source/WTF/wtf/dtoa/utils.h
@@ -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(SPARC) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA)
+#elif CPU(MIPS) || CPU(MIPS64) || CPU(PPC) || CPU(PPC64) || CPU(PPC64LE) || OS(WINCE) || CPU(SH4) || CPU(S390) || CPU(S390X) || CPU(IA64) || CPU(SPARC) || CPU(ALPHA) || CPU(ARM64) || CPU(HPPA)
 #define DOUBLE_CONVERSION_CORRECT_DOUBLE_OPERATIONS 1
 #elif defined(_M_IX86) || defined(__i386__)
 #if defined(_WIN32)