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diff --git a/build/cxx/utility.txx b/build/cxx/utility.txx
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+// file : build/cxx/utility.txx -*- C++ -*-
+// copyright : Copyright (c) 2014-2015 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+using namespace std;
+
+namespace build
+{
+ namespace cxx
+ {
+ template <typename T>
+ void
+ append_std (cstrings& args, T& t, std::string& s)
+ {
+ if (auto val = t["cxx.std"])
+ {
+ const std::string& v (val.template as<const string&> ());
+
+ // Translate 11 to 0x and 14 to 1y for compatibility with
+ // older versions of the compiler.
+ //
+ s = "-std=c++";
+
+ if (v == "11")
+ s += "0x";
+ else if (v == "14")
+ s += "1y";
+ else
+ s += v;
+
+ args.push_back (s.c_str ());
+ }
+ }
+ }
+}