Hey? Where did the intrinsics go?

[Øystein Johansen]

As I have written in an earlier post here, I'm trying to vectorize some 
loops with intrinsics and I have also got a gcc 4.1 snapshot (20050410). 
However when I try to compile my code with the gcc-4.1 snapshot I get:

/msys/1.0/home/mingw/bin/gcc.exe -g -Wall -O3 -msse -mtune=pentium3 
-DHAVE_CONFIG_H  -I. -I..   -c -o neuralnet.o neuralnet.c
neuralnet.c: In function 'Evaluate':
neuralnet.c:492: warning: implicit declaration of function 
'__builtin_ia32_loadaps'
neuralnet.c:492: error: incompatible types in assignment
neuralnet.c:493: error: incompatible types in assignment

And so on....
Am I missing an header include somewhere...??
-Øystein