Reported by Nicola Fontana, May 27, 2012
Actually the configure script checks only for gladeui-1.0. Prepend a check for gladeui-2.0 that AFAIK is compatible to gladeui-1.0.
Comment 1 by Nicola Fontana, May 27, 2012
Issue closed by commit e0dc0a71ef997695ee86c3eb5c4fcca70e6dce7f. Actually support to gladeui-2.0 cannot be added because it depends on GTK+3 and gtk2panel is (as the name implies) GTK+2 based