-t 0to your configure flags.
Assuming all your platforms provide the same type of threading (eg., pthreads),
then you may also build the threaded libraries. However, since ATLAS uses
processor affinity, you will need to build the threaded libs to match the
smallest number of processors of any machine you are targeting. You can
limit the number of processors to compile for using the
configure flag, where
X is the number of processors to tune for.
So, if your smallest targeted core count was 2, you would add
to your configure flags.