title: stuck in using Megam in Python ( nltk.classify.MaxentClassifier)
body: <p>I'm using ubuntu x64, after two days and searching all the net, still i've not been able to install Megam,
  i've read all information in this page <a href="http://www.cs.utah.edu/~hal/megam/" rel="noreferrer">http://www.cs.utah.edu/~hal/megam/</a>
  and installed x64 version of o'calm from <a href="http://packages.ubuntu.com/precise/ocaml" rel="noreferrer">http://packages.ubuntu.com/precise/ocaml</a>
  but when i want to use "megam" as a classifier in python, it says:</p>
  
  <blockquote>
    <p>"NLTK was unable to find the megam file! Use software specific
    configuration paramaters or set the MEGAM environment variable.</p>
  </blockquote>
  
  <p>could anybody tell me how can i install and make use of it in python?</p>
  
  <p>i've downloaded "<code>ocaml-3.12.1.tar.gz</code>" but the "make" command doesn't work (as it's said in its readme).
  i've downloaded "<code>megam_i686.opt</code>" too, but it's not executable and i cannot run it</p>
  
  <p>any help?</p>
  
  <p>thanks in advance</p>