Today I have removed support for 
GTK+-2.0 (and unfortunately
    
DirectFB, because 
GTK+-3.0 does not support it
    anymore).
    
    Why did I do this?
    
    
      - As with all new versions of GTK+-3.0 comes with
        interesting features (such as CSS to customize the
        widgets) that are not available in GTK+-2.0. It is
        relatively a handicap for development.
- GTK+-2.0 is much heavier than GTK+-3.0, because
        GTK+-3.0 removes many features depreciated. This
        handicaps even more the development, requiring many #ifdef block
        in the code.
- The library WebKitGTK already has a port to GTK+-3.0
        (although they still maintain the development of the branch GTK+-2.0),
        so switching to GTK+-3.0 will be invisible on this side
        of.
- GTK+-3.0 is already in the repositories of many GNU/Linux
        distributions (such as Gentoo, Debian testing/sid,
        archlinux, ...), its installation for the developer
        and/or the user is not the most complicated. On this point, we
        could say that is because this version was released several
        months ago.
    So I wont maintain any longer the support of the two releases, I
    encourage you to install 
GTK+-3.0 if not already done.