> GTK 2.4.0 is told
> to be source- and binary-compatible with previous one.. I suppose, 
> that in
> the next few days I'll see if that's really true :)

There is one known glitch with source compatibility: GtkOptionMenu is 
now deprecated (replaced by the new combo box widget), and while the 
code is all still there, the headers are wrapped in #ifndef 
GTK_DISABLE_DEPRECATED. Many existing gtk/gnome apps unconditionally 
define GTK_DISABLE_DEPRECATED in their Makefiles, so they'll break if 
you try to compile them against 2.4. The fix is to just remove the 
offending -D flag. (And many of the affected apps will have new 
versions coming out as part of the GNOME 2.6 release next week that fix 
the problem.)

-- Dan