--- src/common/classes/FpeControl.h
+++ src/common/classes/FpeControl.h
@@ -222,7 +222,7 @@
 {
 	return (!_finite (x) && !isnan(x));
 }
-#else
+#elif !defined _LIBCPP_VERSION || _LIBCPP_VERSION < 3900
 #ifndef isinf
 template <typename F>
 inline bool isinf(F x)