Install meld

sudo git clone https://git.gnome.org/browse/meld /opt/meld2
ln -s /opt/meld/bin/meld
sudo mv meld /usr/bin

Ajouter la conf meld

git config --global diff.external ~/.git/difftool.py

Correction arguments

echo "#!/usr/bin/python

import sys
import os

os.system('meld "%s" "%s"' % (sys.argv[2], sys.argv[5]))" > ~/.git/difftool.py
chmod +x ~/.git/difftool.py