I've run into this problem too.  I ended up using glade-3.8.x, which still creates gtk2-compatible builder files.  On Fedora linux, I use the glade3-3.8.2 RPMs and run /usr/bin/glade-3.  The plain glade RPMs contain version 3.10.x as /usr/bin/glade, which only creates gtk3-compatible builder files.  So unfortunately, yes, we're sort of stuck with this old version of glade until gtk2hs gets updated.

-- Garrett Mitchener

On Sat, Aug 4, 2012 at 6:45 AM, <timothyhobbs@seznam.cz> wrote:
Does the fact that glade now uses gtk3 and gtk2hs is still on 2 mean that I cannot use glade with gtk2hs without installing some ancient version of glade?


Live Security Virtual Conference
Exclusive live event will cover all the ways today's security and
threat landscape has changed and how IT managers can respond. Discussions
will include endpoint security, mobile security and the latest in malware
threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
Gtk2hs-users mailing list