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diff --git a/libbutl/path-io.hxx b/libbutl/path-io.hxx
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+// file      : libbutl/path-io.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef LIBBUTL_PATH_IO_HXX
+#define LIBBUTL_PATH_IO_HXX
+
+#include <ostream>
+
+#include <libbutl/path.hxx>
+
+namespace butl
+{
+  // This is the default path IO implementation. The reason it is
+  // separate is because one often wants a custom implementation.
+  // For example, we may want to print paths as relative to the
+  // working directory. Or we may want to print '~' for the home
+  // directory prefix. Or we may want to print dir_path with a
+  // trailing '/'.
+  //
+  template <typename C, typename K>
+  inline std::basic_ostream<C>&
+  operator<< (std::basic_ostream<C>& os, basic_path<C, K> const& p)
+  {
+    return os << p.string ();
+  }
+}
+
+#endif // LIBBUTL_PATH_IO_HXX