plunit_install.txt

# install the necessary packages
sudo apt-get install autoconf
sudo apt-get install make

# make the plunit module
git clone git://www.swi-prolog.org/home/pl/git/pl.git
cd pl/
git submodule status
git submodule update --init packages/plunit/
cd packages/plunit/
autoconf
./configure 
sudo make install

# if `swipl -v` returns a version lower than 6 (e.g. "SWI-Prolog version 5.10.1 for amd64"), you must update SWI-Prolog

# SWI-Prolog update on Debian
# to /etc/apt/preferences
Package: swi-prolog
Pin: release a=experimental
Pin-Priority: 800

Package: swi-prolog-nox 
Pin: release a=experimental
Pin-Priority: 800

Package: swi-prolog-x
Pin: release a=experimental
Pin-Priority: 800

# to /etc/apt/sources.list
deb http://ftp.debian.org/debian experimental main

# update the packages
sudo apt-get update
sudo apt-get upgrade