diff -ru boost_1_34_0/boost/function.hpp boost_1_34_0_ibm/boost/function.hpp
--- boost_1_34_0/boost/function.hpp	2005-08-12 09:02:33.000000000 -0400
+++ boost_1_34_0_ibm/boost/function.hpp	2007-03-20 16:46:00.000000000 -0400
@@ -21,8 +21,8 @@
 // in anything that may be included by function_template.hpp doesn't break
 #include <boost/function/detail/prologue.hpp>
 
-// Visual Age C++ doesn't handle the file iteration well
-#if BOOST_WORKAROUND(__IBMCPP__, >= 500)
+// Older versions of the IBM C++ compiler do not handle file iterations well
+#if BOOST_WORKAROUND(__IBMCPP__, >= 500) && BOOST_WORKAROUND(__IBMCPP__, < 800)
 #  if BOOST_FUNCTION_MAX_ARGS >= 0
 #    include <boost/function/function0.hpp>
 #  endif