Starting from up-to-date base install, this is exactly what I did, pretty sure the virtualenv started:  
```
jeremy@leapclient:~$ git clone https://github.com/leapcode/bitmask_client bitmask
Cloning into 'bitmask'...
remote: Counting objects: 13871, done.
remote: Compressing objects: 100% (7573/7573), done.
remote: Total 13871 (delta 6097), reused 12430 (delta 4840)
Receiving objects: 100% (13871/13871), 5.28 MiB | 1.65 MiB/s, done.
Resolving deltas: 100% (6097/6097), done.
```
```
jeremy@leapclient:~$ cd bitmask/
```
```
jeremy@leapclient:~/bitmask$ git checkout develop
Branch develop set up to track remote branch develop from origin.
Switched to a new branch 'develop'
```
Starting virtualenv here:  
```
jeremy@leapclient:~/bitmask$ virtualenv .
New python executable in ./bin/python
Installing distribute.............................................................................................................................................................................................done.
Installing pip...............done.
```
```
jeremy@leapclient:~/bitmask$ source bin/activate
```
```
(bitmask)jeremy@leapclient:~/bitmask$ pkg/postmkvenv.sh 
```
```
(bitmask)jeremy@leapclient:~/bitmask$ python2 setup.py develop
running develop
Checking .pth file support in /usr/local/lib/python2.7/dist-packages/
error: can't create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/test-easy-install-10078.pth'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

/usr/local/lib/python2.7/dist-packages/

Perhaps your account does not have write access to this directory?  If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account.  If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.

For information on other options, you may wish to consult the
documentation at:

http://packages.python.org/distribute/easy_install.html

Please make the appropriate changes for your system and try again.

(bitmask)jeremy@leapclient:~/bitmask$  
```