Error in compilation of GCC 3.0.3

[Johan van den Berg <vdberj at learn dot unisa dot ac dot za>]

Here is my story:

OS: i386-sequent-sysv4

I compiled and installed the following:
 * GNU make 3.79
 * GNU sed 3.02
 * GNU bison 1.32
 * flex 2.5.4a
 * GNU binutils 2.11.2

I renamed /usr/local/bin/as to /usr/local/bin/gas (gcc expects sequent as)
I also renamed /usr/local/i386-sequent-sysv4/bin/as

I built and installed gcc-2.8.1 under /opt/gcc-2.8.1.  
I set the path to /opt/gcc-2.8.1:/usr/local/bin:/usr/bin:/bin:.

I extracted the source for gcc-3.0.3, and created a native obj directory:
/home/vdberj/gcc-3.0.3/obj-sequent.

In that directory, I ran:
  ../configure --with-gnu-ld --enable-languages=c,c++
  make -j 3 bootstrap (or) make bootstrap (both fail)

Then, after about 30min of compiling, I get this:

cc -DIN_LIBGCC1 -O -I. -I. -I../../gcc -I../../gcc/. -I../../gcc/config -I../../gcc/../include -DL_mulsi3 -c ../../gcc/libgcc1.c -o libgcc/_mulsi3.o
"../../gcc/machmode.h", line 124: syntax error, probably missing ",", ";" or "="
"../../gcc/machmode.h", line 124: syntax error before or at: PARAMS
"../../gcc/machmode.h", line 125: warning: syntax error:  empty declaration
"../../gcc/machmode.h", line 130: syntax error, probably missing ",", ";" or "="
"../../gcc/machmode.h", line 130: cannot recover from previous errors
make[3]: *** [libgcc/_mulsi3.o] Error 1
make[3]: Leaving directory `/home/vdberj/gcc/gcc-3.0.3/obj-sequent/gcc'
make[2]: *** [libgcc.a] Error 2
make[2]: Leaving directory `/home/vdberj/gcc/gcc-3.0.3/obj-sequent/gcc'
make[1]: *** [stage1_build] Error 2
make[1]: Leaving directory `/home/vdberj/gcc/gcc-3.0.3/obj-sequent/gcc'
make: *** [bootstrap] Error 2

Question: Do you know why this is hapening?
Question: Why is it using cc, when using gcc-2.8.1 for the rest?
Possibility: It seems as though my cc doesn't undestand PARAMS.

Any help would be appreciated. Thank you beforehand.

Johan van den Berg