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diff --git a/data/iphoneos-sdk/v1/experimental/ratio b/data/iphoneos-sdk/v1/experimental/ratio
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+// -*- C++ -*-
+//===------------------------------ ratio ---------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef _LIBCPP_EXPERIMENTAL_RATIO
+#define _LIBCPP_EXPERIMENTAL_RATIO
+
+/**
+    experimental/ratio synopsis
+    C++1y
+#include <ratio>
+
+namespace std {
+namespace experimental {
+inline namespace fundamentals_v1 {
+
+  // See C++14 20.11.5, ratio comparison
+  template <class R1, class R2> constexpr bool ratio_equal_v
+    = ratio_equal<R1, R2>::value;
+  template <class R1, class R2> constexpr bool ratio_not_equal_v
+    = ratio_not_equal<R1, R2>::value;
+  template <class R1, class R2> constexpr bool ratio_less_v
+    = ratio_less<R1, R2>::value;
+  template <class R1, class R2> constexpr bool ratio_less_equal_v
+    = ratio_less_equal<R1, R2>::value;
+  template <class R1, class R2> constexpr bool ratio_greater_v
+    = ratio_greater<R1, R2>::value;
+  template <class R1, class R2> constexpr bool ratio_greater_equal_v
+    = ratio_greater_equal<R1, R2>::value;
+
+} // namespace fundamentals_v1
+} // namespace experimental
+} // namespace std
+
+*/
+
+#include <experimental/__config>
+
+#if _LIBCPP_STD_VER > 11
+
+#include <ratio>
+
+_LIBCPP_BEGIN_NAMESPACE_LFTS
+
+#ifndef _LIBCPP_HAS_NO_VARIABLE_TEMPLATES
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_equal_v
+    = ratio_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_not_equal_v
+    = ratio_not_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_less_v
+    = ratio_less<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_less_equal_v
+    = ratio_less_equal<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_greater_v
+    = ratio_greater<_R1, _R2>::value;
+
+template <class _R1, class _R2> _LIBCPP_CONSTEXPR bool ratio_greater_equal_v
+    = ratio_greater_equal<_R1, _R2>::value;
+
+#endif /* _LIBCPP_HAS_NO_VARIABLE_TEMPLATES */
+
+_LIBCPP_END_NAMESPACE_LFTS
+
+#endif /* _LIBCPP_STD_VER > 11 */
+
+#endif // _LIBCPP_EXPERIMENTAL_RATIO