Index: runtime/src/kmp_os.h
===================================================================
--- runtime/src/kmp_os.h
+++ runtime/src/kmp_os.h
@@ -82,9 +82,13 @@
 #undef KMP_HAVE_QUAD
 #define KMP_HAVE_QUAD 1
 #elif KMP_COMPILER_CLANG
-/* Clang doesn't support a software-implemented
-   128-bit extended precision type yet */
+#ifdef __SIZEOF_FLOAT128__
+typedef __float128 _Quad;
+#undef KMP_HAVE_QUAD
+#define KMP_HAVE_QUAD 1
+#else
 typedef long double _Quad;
+#endif
 #elif KMP_COMPILER_GCC
 typedef __float128 _Quad;
 #undef KMP_HAVE_QUAD