diff -r -u boost_1_38_0/boost/asio/serial_port_base.hpp boost_1_38_vxworks/boost/asio/serial_port_base.hpp
--- boost_1_38_0/boost/asio/serial_port_base.hpp	2008-06-19 18:20:52.000000000 -0400
+++ boost_1_38_vxworks/boost/asio/serial_port_base.hpp	2009-04-05 17:31:19.328125000 -0400
@@ -22,6 +22,9 @@
 #include <stdexcept>
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
+
+#if !defined(BOOST_ASIO_DISABLE_SERIAL_PORT)
+
 #if !defined(BOOST_WINDOWS) && !defined(__CYGWIN__)
 # include <termios.h>
 #endif
@@ -156,4 +159,6 @@
 
 #include <boost/asio/detail/pop_options.hpp>
 
+#endif // !BOOST_ASIO_DISABLE_SERIAL_PORT
+
 #endif // BOOST_ASIO_SERIAL_PORT_BASE_HPP
diff -r -u boost_1_38_0/boost/asio/serial_port_service.hpp boost_1_38_vxworks/boost/asio/serial_port_service.hpp
--- boost_1_38_0/boost/asio/serial_port_service.hpp	2008-06-19 18:20:52.000000000 -0400
+++ boost_1_38_vxworks/boost/asio/serial_port_service.hpp	2009-04-05 17:33:30.218750000 -0400
@@ -23,6 +23,8 @@
 #include <string>
 #include <boost/asio/detail/pop_options.hpp>
 
+#if !defined(BOOST_ASIO_DISABLE_SERIAL_PORT)
+
 #include <boost/asio/error.hpp>
 #include <boost/asio/io_service.hpp>
 #include <boost/asio/detail/service_base.hpp>
@@ -219,6 +221,8 @@
 #endif // defined(BOOST_ASIO_HAS_SERIAL_PORT)
        //   || defined(GENERATING_DOCUMENTATION)
 
+#endif // !defined(BOOST_ASIO_DISABLE_SERIAL_PORT)
+	   
 #include <boost/asio/detail/pop_options.hpp>
 
 #endif // BOOST_ASIO_SERIAL_PORT_SERVICE_HPP