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diff --git a/mod/utility.hxx b/mod/utility.hxx
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--- /dev/null
+++ b/mod/utility.hxx
@@ -0,0 +1,25 @@
+// file      : mod/utility.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef MOD_UTILITY_HXX
+#define MOD_UTILITY_HXX
+
+#include <libbrep/types.hxx>
+#include <libbrep/utility.hxx>
+
+namespace brep
+{
+  // Append the @<tenant> leaf component to the directory if the tenant is
+  // not empty. Otherwise, return the directory unchanged.
+  //
+  inline dir_path
+  tenant_dir (const dir_path& dir, const string& tenant)
+  {
+    return !tenant.empty ()
+           ? path_cast<dir_path> (dir / ('@' + tenant))
+           : dir;
+  }
+}
+
+#endif // MOD_UTILITY_HXX