[Mailman-Developers] Help regarding an error during installation

[Daman Singh]

Hello everyone!

I am trying to install mailman for development using mailman-bundler. I
followed  the instructions given here
http://mailman-bundler.readthedocs.org/en/latest/ , but i am facing a
problem.
When i run buildout command i get an error saying,"no module named 'zlib'"
but on running ipython, when i import zlib it works all right.
I am using a virtualenvironment. Basically module named zlib is already
installed but "buildout" command is still giving me error.
Anyone having its fix kindly provide me its fix

Best
Daman