First you have to rebuild and install gtk+ with installed libcups2-dev.
Only the packages libgtk... are needed. Also install it in the sdk. Then
edit the rules of leafpad and / or abiword. Rebuild them with enabled
printing support. That's what I did. Now I can select my printer in the
printing dialog. If you don't build leafpad or abiword against the new
gtk libs, printing will not work.