// William Kempf, Jesse Jones and Karl Nelson were all very helpful in the
// design of this library.
+#include <functional> // unary_function, binary_function
+
#include <boost/preprocessor/iterate.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/function/detail/prologue.hpp>
// Visual Age C++ doesn't handle the file iteration well
-#if BOOST_WORKAROUND(__IBMCPP__, <= 600)
+#if BOOST_WORKAROUND(__IBMCPP__, >= 500)
# if BOOST_FUNCTION_MAX_ARGS >= 0
# include <boost/function/function0.hpp>
# endif