Hi, using Code Blocks i got the following message: ld.exe "Cannot find -lboost_filesystem-mgw-mt-s-l_33_l" Then: cd C:\Documents and Settings\Administrateur\Bureau\boost_1_34_0\boost_1_34_0\tools\jam\src then.\\build.bat. Then I set the following variables: BOOST_ROOT= C:\Documents and Settings\src\boost and BOOST_BUILD_PATH=C:\Documents and Settings\src\boost\tools\build\v2. I don't know what to do now. So what must I do now in order not to get the message any more? Be clear. Thank You _________________________________________________________________ Le blog Messenger de Michel, candidat de la Nouvelle Star : analyse, news, coulisses… A découvrir ! http://michel-nouvelle-star2007.spaces.live.com/