building gps 3.1.3

hi,all
here is some problem in building  gps 3.1.3=20
I have install all the package form the libre webset it provides.
when I build gps source here is the problem=20
-------------------------------------------------
gnatmake -Pgps gps-main.adb
gcc -c -g -gnatec=3D/gps/gps-3.1.3/gps/gnat.adc -O2 -gnatn -gnatws -I-
-gnatA /gps/gps-3.1.3/gps/src/gps-main.adb
scng.adb:1982:20: "Category" is undefined (more references follow)
scng.adb:1996:20: "Get_Category" is not visible (more references
follow)
scng.adb:1996:20: non-visible declaration at
codefix-errors_manager.ads:91
gnatmake: "/gps/gps-3.1.3/gps/src/gps-main.adb" compilation error
make[1]: *** [internal-build] Error 4
make: *** [default] Error 2
[root@bjut gps-3.1.3]#
-------------------------------------------
oh , I forgot to told us that I used the redhat fc 4
gcc 4.0.0=20
I didn't build the gnat-gpl-2005 source, If I use the system gcc ,does
it ok? Is it necessory for me to build the gnat-gpl-source? or may I
use the latesty gcc to instead ?

         thanks so much=20
          wishes!

=20

-------------------------------------------------------------------------=
----
     alwyn lee
[email protected]   (Messenger)
[email protected]   (Mail)

-------------------------------------------------------------------------=
----


=20
_________________________________________________________________________=
___________
Do you Yahoo!?
Everyone is raving about the all-new Yahoo! Mail beta.
http://new.mail.yahoo.com