Helper for yaourt (Archlinux) which ignore to reinstall packages whereas they are already installed
Install : building with PKGBUILD = makepkg installing pkg.tar.xz = pacman -U yaourt-helper-1.0-1-x86_64.pkg.tar.xz
Usage : yaourt-helper.sh PACKAGE #where PACKAGE is package you want to install
Source : https://unix.stackexchange.com/questions/68626/make-yaourt-does-not-reinstall-when-already-installed