brew install cartr/qt4/pyqt
sudo mkdir -p /Users/username/Library/Python/2.7/lib/python/site-packages
sudo vim /Users/username/Library/Python/2.7/lib/python/site-packages/homebrew.pth
import site; site.addsitedir("/usr/local/lib/python2.7/site-packages")
sudo apt-get install python-qt4
sudo yum install PyQt4
git clone https://github.com/cao19881125/YtOvs.git
cd YtOvs
pip install .
yt-ovs