make nabviz-top Error!!!

Hello All,
           I have installed ocaml-3.09 and all other dependencies as
specified in the respective README files. But, when finally
when I want to compile nab, with the gui support, it gives the
following error

---------------------------------------------------------------------------
/usr/local/bin//ocamlc.opt  -g  -w A    -I /usr/local/lib/ocaml/lablgtk -I
/usr/local/lib/ocaml/gsl  -I lib  -I lib/contrib  -I gui  -I sim/base  -I
sim/interfaces  -I sim/radios  -I sim/mac  -I sim/mob  -I sim/pkt  -I
proto/str  -I proto/aodv  -I proto/diff  -I proto/misc  -I proto/ler  -I
proto/rwr  -I scripts  -I proto/str/scripts -I scripts -I gui/data -c
gui/gui_gtk.mli
File "gui/gui_gtk.mli", line 37, characters 2-13:
Unbound type constructor GObj.widget
make: *** [gui/gui_gtk.cmi] Error 2
---------------------------------------------------------------------------
I checked the file /nab/gui/gui_gtk.mli. Since I am not so familiar with
Ocaml, I could'nt figure out what the problem was. Any help is greatly
appreciated and Thanks a zillion.

My installation paths:

/usr/local/lib/ocaml/gsl
/use/local/lib/ocaml/laglgtk2
/home/xxx/nab

Senthil Rajan,
Systems Administrator
Dept Of Computer Science,
#148 Martin Speare Bldg
NMT, Socorro 87801, U.S.A
Phone: Off - 505 835 5049
       Res - 505 385 4244