GetDistGui Setup

For linux:

Install python-pyside using your system package manager

bash $ sudo apt install python-pyside
Or
bash $ sudo dnf install python-pyside

If you do not have root permissions, even the following may work

bash $ pip install --user pyside

Then install the getdist version I have modified:

bash $ pip install --user git+https://github.com/surhudm/getdist.git

This should install GetDistGUI.py to $HOME/.local/bin

bash $ export PATH=$PATH:$HOME/.local/bin

The following should work:
bash $ GetDistGUI.py

For MacOSX, it is a bit more involved

Install QT using brew
brew install qt@5.5 openssl cmake pyqt

Then install pyside:
git clone --recursive https://codereview.qt-project.org/pyside/pyside-setup
CXXFLAGS=-std=c++11 python setup.py bdist_wheel --ignore-git --qmake=/usr/local/Cellar/qt/5.8.0_2/bin/qmake --cmake=/usr/local/bin/cmake --openssl=/usr/local/Cellar/openssl/1.0.2k/bin/

You may have to change the directory names above.