Index: cmath.hpp
===================================================================
--- cmath.hpp	(revision 70956)
+++ cmath.hpp	(working copy)
@@ -18,7 +18,9 @@
 #     define BOOST_CONFIG_NO_CMATH_RECURSION
 #  endif
 
+#  if defined(__cplusplus)
 #  include <cmath>
+#  endif
 
 #  ifdef BOOST_CONFIG_NO_CMATH_RECURSION
 #     undef BOOST_TR1_NO_RECURSION
Index: complex.hpp
===================================================================
--- complex.hpp	(revision 70956)
+++ complex.hpp	(working copy)
@@ -18,7 +18,9 @@
 #     define BOOST_CONFIG_NO_COMPLEX_RECURSION
 #  endif
 
+#  if defined(__cplusplus)
 #  include <complex>
+#  endif
 
 #  ifdef BOOST_CONFIG_NO_COMPLEX_RECURSION
 #     undef BOOST_TR1_NO_RECURSION
Index: functional.hpp
===================================================================
--- functional.hpp	(revision 70956)
+++ functional.hpp	(working copy)
@@ -18,7 +18,9 @@
 #     define BOOST_CONFIG_NO_FUNCTIONAL_RECURSION
 #  endif
 
+#  if defined(__cplusplus)
 #  include <functional>
+#  endif
 
 #  ifdef BOOST_CONFIG_NO_FUNCTIONAL_RECURSION
 #     undef BOOST_TR1_NO_RECURSION
Index: memory.hpp
===================================================================
--- memory.hpp	(revision 70956)
+++ memory.hpp	(working copy)
@@ -18,7 +18,9 @@
 #     define BOOST_CONFIG_NO_MEMORY_RECURSION
 #  endif
 
+#  if defined(__cplusplus)
 #  include <memory>
+#  endif
 
 #  ifdef BOOST_CONFIG_NO_MEMORY_RECURSION
 #     undef BOOST_TR1_NO_RECURSION
Index: utility.hpp
===================================================================
--- utility.hpp	(revision 70956)
+++ utility.hpp	(working copy)
@@ -18,7 +18,9 @@
 #     define BOOST_CONFIG_NO_UTILITY_RECURSION
 #  endif
 
+#  if defined(__cplusplus)
 #  include <utility>
+#  endif
 
 #  ifdef BOOST_CONFIG_NO_UTILITY_RECURSION
 #     undef BOOST_TR1_NO_RECURSION