Hi Thomas, The source file "phoenix/core/terminal.hpp" contains ... #include <boost/phoenix/core/as_actor.hpp> I don't have "as_actor.hpp" file. I am using: MSVC 2008 Phoenix V3 revision: 69191 Boost-trunk revision: 69191 I am trying to compile the "container_actor.cpp" file in example folder. Compiling... container_actor.cpp c:\program files\boost\boost-trunk\boost\phoenix\core\terminal.hpp(14) : fatal error C1083: Cannot open include file: 'boost/phoenix/core/as_actor.hpp': No such file or directory define_expression.cpp c:\program files\boost\boost-trunk\boost\phoenix\core\terminal.hpp(14) : fatal error C1083: Cannot open include file: 'boost/phoenix/core/as_actor.hpp': No such file or directory Regards, Fernando Pelliccioni.