You 're right, there are very much conflicting packages :
libc6-dev depends on libc6 (2.5.0-1osso7 but 2.5.0-1osso10 sould be installed)
g++ depends on g++-3.4 (>=3.4.4.cs2005q3.1-3)

I tried to follow the hierarchy of these packages but i did not succeed. Is it possible to install a tool such as synaptic which will manage these confilts ?

Thank you for your help.