diff -ru boost_1_34_0/boost/numeric/interval/detail/ppc_rounding_control.hpp boost_1_34_0_ibm/boost/numeric/interval/detail/ppc_rounding_control.hpp
--- boost_1_34_0/boost/numeric/interval/detail/ppc_rounding_control.hpp	2005-09-12 14:31:15.000000000 -0400
+++ boost_1_34_0_ibm/boost/numeric/interval/detail/ppc_rounding_control.hpp	2007-05-17 16:48:00.000000000 -0400
@@ -51,10 +51,14 @@

 } // namespace detail

+// Do not declare the following C99 symbols if <math.h> provides them.
+// Otherwise, conflicts may occur, due to differences between prototypes.
+#if !defined(_ISOC99_SOURCE) && !defined(__USE_ISOC99)
 extern "C" {
   float rintf(float);
   double rint(double);
 }
+#endif

 template<>
 struct rounding_control<float>: