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Debian / Ubuntu
Since Debian Sarge (3.1) you can use apt-get to obtain GNUstep packages.
# apt-get install x-window-system-core wmaker gnustep gnustep-devel gnustep-games
to install GNUstep, X11 and Window Maker.
The best way to get up-to-date GNUstep packages is to upgrade from stable to testing or unstable. If upgrading to Debian unstable is not desirable it is possible to simply add the unstable apt lines to the sources.list and specify the distribution when installing the packages, e.g.
# apt-get install -t unstable gnumail.app
This method might upgrade some other packages to satisfy dependencies, but will have a much smaller impact on the system since only the packages on which GNUstep depends will be upgraded.
As Ubuntu is Debian-based you can likewise install gnustep libraries (and their dependencies) via
sudo apt-get install gnustep gnustep-devel
apt will also suggest a lot of apps to install.
Install from source: Dependencies
If you want to compile from source install the following Dependencies packages (applies to both Debian and Ubuntu):
gobjc, libx11-dev, libx11-xft, libxmu-dev, libtiff4-dev, libpng12-dev, libungif4-dev, libart-2.0-dev, libxml2-dev, libxslt1-dev, libssl-dev, libgmp3-dev, libffcall1-dev, libcairo2-dev (universe), and svn if you want to download the svn version.
Optional: libaspell-dev for GSspell.service
Please follow the instructions on GNUstep_SVN_installation_guide.
To install GNUstep libs and scripts, do
For a list of GNUstep-related ebuilds, see the Online Package Database.
For the most recent packages, type
ACCEPT_KEYWORDS="~x86" emerge package-name (or analogically for your cpu family: "~sparc", "~ppc" ...)
Libraries and accompanying applications will build with no modifications. Slackware 10.2 ships with GCC 3.3.6, so mixed Objective-C and C++ code is not supported, meaning additional frameworks/libraries may not be supported.
This version of Slackware works the same as the previous (10.2). Libraries and applications will build with no modifications, but due to the GCC version used (3.4.6) Objective-C++ is not supported.
GNUstep compiles and install on Slackware 12.0 perfectly. Unfortunately, this version of Slackware does not include an Objective-C++ compiler.
Slackware packages have been created and can be found in:
- GNUstep FTP (Please read gnustep-core.README before installing)
SlackBuild scripts can be found at:
Packages for GNUstep releases can be found on the Open Build Service (OBS).
The package of pixman that comes with OpenSuse 11.3 seems to be broken for some graphic drivers. You may either downgrade or upgrade to another version of pixman (plus cairo) or use a different GNUstep backend. For me upgrading to the cairo version as provided by the GNOME Factory project on the OpenSuse Build Service worked perfectly. 
Packages provided by Richard Stonehouse here (including installation instructions).
These versions require that you install a few dev packages (e.g. libffi dev, cairo dev, ...), then GNUstep SVN compiles out of the box.