Index: boost/variant/detail/substitute.hpp
===================================================================
--- boost/variant/detail/substitute.hpp	(revision 49077)
+++ boost/variant/detail/substitute.hpp	(working copy)
@@ -151,7 +151,10 @@
 
 ///// iteration, depth == 1
 
-#elif BOOST_PP_ITERATION_DEPTH() == 1
+// For gcc 4.4 compatability, we must include the
+// BOOST_PP_ITERATION_DEPTH test inside an #else clause.
+#else // BOOST_PP_IS_ITERATING
+#if BOOST_PP_ITERATION_DEPTH() == 1
 #define i BOOST_PP_FRAME_ITERATION(1)
 
 #if i > 0
@@ -228,4 +231,5 @@
 #endif // i
 
 #undef i
+#endif // BOOST_PP_ITERATION_DEPTH()
 #endif // BOOST_PP_IS_ITERATING