Debian packaging using dh-virtualenv
To build version in current branch, you should use git-buildpackage and pbuilder. Pbuilder will create clean chroot environment and install required dependencies so you don't need to mess up your system.
Alternatively you can install build dependencies on your own and execute plain dpkg-buildpackage -uc -us
USENETWORK=yes
COMPONENTS="main universe multiverse restricted"
cowbuilder --create trusty
Install dependencies
apt-get install cowbuilder pbuilder git-buildpackage dh-virtualenv dh-python
Maybe dh-virtualenv will not be in latest version wich is not present in latest