2) then you have to create a directory for DCE and configure it using bake:
cd
mkdir dce
cd dce
$HOME/bake/bake.py configure -e dce-ns3-1.2
3) You can then download and install ns-3 and dce:
$HOME/bake/bake.py deploy
4) *Pay attention* to the output. If something goes wrong, it can help you.
./waf --run EXAMPLE_NAME
Desktop/bake/dce# bake.py configure -e dce-ns3-1.2bake.py: command not found
then I have got this error,