About GTK+ 2.0 / 3.0¶

For Linux developpers, you should install the packages for your dist, if exist. Otherwise, you could read the doc to compile from the source :
http://developer.gnome.org/gtk3/stable/gtk-building.html

For Windows users, you should read the doc written by Tor Lillqvist. You can found more informations here : http://www.gtk.org/download-windows.html

With GTK 2.0¶

In include/main.h, don't forget to uncomment
#define SCOL_GTK_2

To Do ...

With GTK 3.0¶

On Windows system :

At this time (April 6, 2011), there is not a bundle and Tor Lillqvist announce he doesn't more : http://tml-blog.blogspot.com/2011/03/gtk-on-windows-i-am-not-really-doing-it.html
However, the openSUSE Build Service would make all it.
So, before a next bundle, you can do it :

• Download from http://download.opensuse.org/repositories/windows:/mingw:/win32/openSUSE_Factory/noarch/
1. mingw32-atk-1.32.0-2.55.noarch.rpm
2. mingw32-fontconfig-2.8.0-1.122.noarch.rpm
3. mingw32-freetype-2.4.4-1.34.noarch.rpm
4. mingw32-gdk-pixbuf-2.22.1-4.25.noarch.rpm
5. mingw32-glib2-2.28.5-1.2.noarch.rpm
6. mingw32-gtk3-3.0.6-1.5.noarch.rpm
7. mingw32-gtk3-lang-3.0.6-1.5.noarch.rpm
8. mingw32-libcairo2-1.10.2-2.14.noarch.rpm
9. mingw32-libexpat-2.0.1-3.161.noarch.rpm
10. mingw32-libintl-0.18.1.1-8.13.noarch.rpm
11. mingw32-libpng-1.5.1-2.16.noarch.rpm
12. mingw32-pango-1.28.3-1.70.noarch.rpm
13. mingw32-zlib-1.2.5-1.70.noarch.rpm

(Note that the number versions could be changed when you read this page)
(Note2 : maybe, depend on your configuration, others packages can be needed)

• Extract these files to the same folder (bin/, etc/, lib/ and share/).

• Eventually, modify your PATH to include this directory.

Note :
To extract these rpm files, you should be on a Linux. If you can not, the 7z file below contains them (at this time, so, can not be up-to-date) : http://redmine.scolring.org/projects/lib2dgtk/repository/changes/dllwindowsrequises/gtk3_dll_win32_april06.7z