I'm using the QSH environment on AS400 and the "ixlc" compiler (basically just CRTCPPMOD), trying to compile the following test program: #include <iostream> #include <boost/foreach.hpp> int main(int argc, char** argv) { std::string hello = "Hello, world!"; BOOST_FOREACH( char ch, hello ) { std::cout << ch << std::endl; } return (EXIT_SUCCESS); } Which results in the following errors: The compilation failed. /home/jbrisbin/include/boost/type_traits/is_member_pointer.hpp Line 000054 "/home/jbrisbin/include/boost/type_traits/ is_member_pointer.hpp", line 54.63: CZP0403(30) "template <class T, class U> struct boost::is_member_pointer<U T::* const>" is alread ERROR 1 001 /home/jbrisbin/include/boost/type_traits/is_member_pointer.hpp Line 000055 "/home/jbrisbin/include/boost/type_traits/ is_member_pointer.hpp", line 55.63: CZP0403(30) "template <class T, class U> struct boost::is_member_pointer<U T::* volatile>" is alr ERROR 1 001 /home/jbrisbin/include/boost/type_traits/is_member_pointer.hpp Line 000056 "/home/jbrisbin/include/boost/type_traits/ is_member_pointer.hpp", line 56.63: CZP0403(30) "template <class T, class U> struct boost::is_member_pointer<U T::* const volatile>" ERROR 1 001 2 000051 The full text of the error complains that these are already defined. Does anyone have pointers or tricks that could point me in the right direction to compile programs that use header-only Boost libs on the AS400? Any help would be appreciated! :) Jon Brisbin Portal Webmaster NPC International, Inc.