building 4.0.0 and ada with gnat-3.15p

[Chris McCraw <fool at cs dot utexas dot edu>]

has anyone managed this with success?  i can built ada programs just
fine with "gnatmake file.adb" when the gnat 3.15p binary distribution
is at the end of my $PATH, but i cannot build gcc-4.0 after a
configure --enable-languages=ada with it at the end of my $PATH

i am trying to use gcc-3.3.4 to build gcc-4.0, rather than the ancient
version of gcc that ships with gnat (so, putting the gnat dir in my
$PATH first doesn't seem to be an option since the gcc binary there
will overshadow /usr/local/bin/gcc which is otherwise first in my $PATH).

i have no ada support in my gcc-3.3.4 build but would like it in my
4.0.0 build.  below is the error during the 'make bootstrap':

make[2]: Entering directory `/v/filer3/v1q010/fool/Work/build/lin_gcc/gcc'
gcc -c -g -DENABLE_CHECKING -DENABLE_ASSERT_CHECKING      -gnatpg -gnata -I- -I. -Iada -I/u/fool/Work/build/gcc-4.0.0/gcc/ada /u/fool/Work/build/gcc-4.0.0/gcc/ada/ada.ads -o ada/ada.o
gcc: /u/fool/Work/build/gcc-4.0.0/gcc/ada/ada.ads: Ada compiler not installed on this system
make[2]: *** [ada/ada.o] Error 1
make[2]: Leaving directory `/v/filer3/v1q010/fool/Work/build/lin_gcc/gcc'
make[1]: *** [stage1_build] Error 2
make[1]: Leaving directory `/v/filer3/v1q010/fool/Work/build/lin_gcc/gcc'
make: *** [bootstrap] Error 2

i use debian stable and a self-built gcc-3.3.4 which works well otherwise.

will gcc-4.0.0 build with gcc-2.8.1? (what ships with gnat-3.15p, the latest
binary distribution i could find...)

thanks in advance for any advice!