diff -up webkitgtk-2.3.2/Source/WTF/wtf/Atomics.h.libatomic webkitgtk-2.3.2/Source/WTF/wtf/Atomics.h
--- webkitgtk-2.3.2/Source/WTF/wtf/Atomics.h.libatomic	2013-12-05 15:43:22.160186327 +0100
+++ webkitgtk-2.3.2/Source/WTF/wtf/Atomics.h	2013-12-05 15:44:02.630264977 +0100
@@ -101,11 +101,11 @@ inline int atomicDecrement(int volatile*
 
 #elif COMPILER(GCC)
 
-inline int atomicIncrement(int volatile* addend) { return __sync_add_and_fetch(addend, 1); }
-inline int atomicDecrement(int volatile* addend) { return __sync_sub_and_fetch(addend, 1); }
+inline int atomicIncrement(int volatile* addend) { return __atomic_fetch_add(addend, 1, __ATOMIC_ACQ_REL); }
+inline int atomicDecrement(int volatile* addend) { return __atomic_fetch_sub(addend, 1, __ATOMIC_ACQ_REL); }
 
-inline int64_t atomicIncrement(int64_t volatile* addend) { return __sync_add_and_fetch(addend, 1); }
-inline int64_t atomicDecrement(int64_t volatile* addend) { return __sync_sub_and_fetch(addend, 1); }
+inline int64_t atomicIncrement(int64_t volatile* addend) { return __atomic_fetch_add(addend, 1, __ATOMIC_ACQ_REL); }
+inline int64_t atomicDecrement(int64_t volatile* addend) { return __atomic_fetch_sub(addend, 1, __ATOMIC_ACQ_REL); }
 
 #endif