Building R-devel with ACML

I'm trying to build R-devel with AMD's ACML.  I downloaded version 3.0.0 
64bit for gfortran (acml-3-0-0-gfortran-64bit.tgz) and copied the 
libraries to /usr/local/lib.  When I configure R to build against the 
ACML library, how do I know if the library has been detected and will be 
used?

I run 'configure' with the '--with-blas=-lacml' flag and am using gcc 
4.0.2 (with gfortran) on FC4.

Thanks,
-roger

Roger D. Peng  |  http://www.biostat.jhsph.edu/~rpeng/