title: ns2 installation and compilation
body: <p>I run ns-2.35 on my Ubuntu 12.10</p>
  
  <p>While I finished installing my ns2 and tried to run via "sudo ns xxx.tcl", it showed on the screen saying that there was no ns2 on my computer and I have to use "apt-get install ns2". I used it, and then it was installed successfully.</p>
  
  <p>Now I modify some .cc files and recompile my ns2, and it is successful, too.</p>
  
  <p>But the problem is that the results are not modified as I want. In fact, the result doesn't change. It seems my modification doesn't really change anything in my ns2. Why? There's no error in my installation or compilation? I am so confused. Is there anyone face the same problem? Thanks in advance!</p>