BOOST: Duvida link em um asynchronous TCP server

Hi everyone,
I'm new at this list and new using the boost library. I'm little by little learning about boost.
Now I was trying to do this example:
http://www.boost.org/doc/libs/1_36_0/doc/html/boost_asio/tutorial/tutdaytime3.html
The source is here:
http://www.boost.org/doc/libs/1_36_0/doc/html/boost_asio/tutorial/tutdaytime3/src.html
But when I try to link I get this errors:
/usr/include/boost/system/error_code.hpp undefined reference to `boost::system::get_posix_category()'

The program is linking with the follows boost librarys:
boost_filesystem-gcc42-mt
boost_system-gcc42-mt
boost_unit_test_framework-gcc42-mt

Maybe I forgot something when I did compile boost?
My version of boost is 1.36.
I use Linux (Slackware 12.1 + KDE 4.1), gcc 4.2.3 and Eclipse+CDT

Best Regards

--
Daniel C. Franša
Tecnosapiens: http://tecnosapiens.wordpress.com
24Quadros: http://24quadros.wordpress.com