aptitude install build-essential 
Reading package lists... Done
Building dependency tree... Done
Reading extended state information      
Initializing package states... Done
Reading task descriptions... Done  
Building tag database... Done    
The following packages are BROKEN:
  libc6-dev 
The following NEW packages will be automatically installed:
  g++ g++-4.1 libstdc++6-4.1-dev linux-kernel-headers 
The following NEW packages will be installed:
  build-essential g++ g++-4.1 libstdc++6-4.1-dev linux-kernel-headers 
0 packages upgraded, 6 newly installed, 0 to remove and 0 not upgraded.
Need to get 8848kB of archives. After unpacking 38.4MB will be used.
The following packages have unmet dependencies:
  libc6-dev: Depends: libc6 (= 2.3.6.ds1-13) but 2.5-9 is installed.
Resolving dependencies...
The following actions will resolve these dependencies:

Keep the following packages at their current version:
build-essential [Not Installed]
g++ [Not Installed]
g++-4.1 [Not Installed]
libc6-dev [Not Installed]
libstdc++6-4.1-dev [Not Installed]

Score is -9965

Accept this solution? [Y/n/q/?]