Package conflict while installing bitmask_client

For installing bitmask_client, I followed the guide given https://github.com/leapcode/bitmask_client/.

After running the command @pip install -r pkg/requirements.pip@ and then executing @python2 setup.py develop@, I get the following requirement error:

Processing dependencies for leap.bitmask==0.3.8-154-gabfaf49
error: Installed distribution psutil 2.0.0 conflicts with requirement psutil==1.2.1

As far as I know this is due to a specific version required by bitmask_client. But there is no such version specified in the pkg/requirements.pip file.

Even after manually installing the required version, ie. 1.2.1 of psutil using @pip install psutil==1.2.1@, and deleting the previously installed version, running @python2 setup.py develop@ followed by @bitmask --debug@ throws the following ImportError exception.

ImportError: No module named _scrypt

I am using Elementary OS with Linux Kernel Version 3.8.0-35-generic on a 64-bit notebook.

(from redmine: created on 2014-03-12, closed on 2014-03-18, relates #4948 (closed), relates #3812 (closed), relates #5489 (closed))