-fopenmp

Hi everybody,
just wanted to know if it is possible to use the openmp library in 
Fortran code to be used within R.
I tried this simple thing:

subroutine test
!$OMP parallel
write(*,*) 'hello'
!$OMP end parallel
end subroutine test

and I compiled in the following way:

R CMD SHLIB test.f90 -fopenmp

but is seems not working.
The program correctly print me out four times 'hello' if I compile 
outside R simply using gfortran with the flag -fopenmp.
If someone can help me I would be very grateful.
Thanks in advance and regards
Filippo Monari