I have no anti-aliasing in any gnome application (neither in the desktop). I have setup Gnome to use it but it does not do it simply.
Any ideas?

Anti-aliasing for what? Fonts? Are they enabled in X? Try googling for "Font de uglification" there should be a very useful howto with "FDU" in the url. Read that

That depends. If you're using Gnome 1.x (and thus GTK 1.x), you need libgdkxft.

If you're using Gnome 2.x (GTK 2.x) you need a whole slew of stuff, such as freetype2, fontconfig, libxft2 and pango. Most of this should be included and configured though, which leads me to:

Does your X server have the RENDER extension? That is the basic requirement. Do the following in an Xterm:

It should say 'RENDER' when you have the extension.

1st of all thanks to reply my problem. Going further let me explain the whole picture.
I have SuSE 8.2. I have been using KDE mainly and it has the AA fonts running flawless. But: if I start my X with Gnome or I launch a gnome application under KDE the fonts are not antialiased. I would like to use Gaim, Ximian evolution and Gnomemeeting.
However I'll check for pango (I beleive it is installed because Gaim needs it).
But I do not know nothing about freetype2 and libxft2. Yesterday I installed fontconfig but I could not figure out its purpose and usage.
What do fontcongig, freetype2 and libxft2 stand for?

Thx,
Teddy