How to use Intel AVX on QNX Neutrino 6.5.0? - avx

Question

I recently started working with QNX 6.5.0 and can't understand how in QNX develop programs using Intel AVX. Installed QNX Development Studio 6.5.0 with GCC 4.4.2, I'm trying to write a simple program, but the build fails.
#include <immitnrin.h>
int main( int argc, char** argv )
{
__m256 var;
__m256 var2;
__m256 result;
var = _mm256_set1_ps(1.f);
var2 = _mm256_set1_ps(3.f);
result = _mm256_add_ps(var,var2);
return 0;
}
error: immitnrin.h: No such file or directory
In function 'int main(int, char**)':
error: '__m256' was not declared in this scope
error: expected ';' before 'var'
error: expected ';' before 'var2'
error: expected ';' before 'result'
error: 'var' was not declared in this scope
error: '_mm256_set1_ps' was not declared in this scope
error: 'var2' was not declared in this scope
error: 'result' was not declared in this scope
error: '_mm256_add_ps' was not declared in this scope
How and where can I learn how to work with SIMD instructions Intel in QNX?
Update
Here's the output from the program make.exe:
make.exe -k CPULIST=x86 all --file=C:/DOCUME~1/Andrew/LOCALS~1/Temp/QMakefile.tmp
C:/QNX650/host/win32/x86/usr/bin/make.exe -j 1 -Cx86 -fMakefile all
make.exe[1]: Entering directory C:/ide-4.7-workspace/project_test_avx/x86'
C:/QNX650/host/win32/x86/usr/bin/make.exe -j 1 -Co -fMakefile all
make.exe[2]: Entering directoryC:/ide-4.7-workspace/project_test_avx/x86/o'