Currently squeeze (testing) and sid (unstable) are supported.
In order to install sugar-jhbuild, you need to install git-core, lsb-release and svn.
After installing and updating sugar-jhbuild according to the common instructions, you can use this invocation to install all dependencies automatically:
./sugar-jhbuild depscheck -s | sudo xargs aptitude -y install
icon-slicer currently is in the process of being accepted into Debian (NEW queue). For the time being, please either install manually (and ignore depscheck complaining about it) or use the packages from Jonas Smedegaard (amd64 only). For the latter, add the following line to /etc/apt/sources.list:
deb http://debian.jones.dk sid sugar-src
To work around a bug in the Gnome Python bindings, you need to issue the following commands after installing all dependencies:
sudo aptitude install chrpath find /usr/lib/pyshared/python2.*/gtk-2.0 -name "*.so" | sudo xargs chrpath -d
With Debian testing ("squeeze"), you should install xulrunner and xulrunner-dev for mozilla to compile correctly (xulrunner-1.9 is not enough).
apt-get install xulrunner xulrunner-dev