'atlc' *did* have C code to allow it to use the Message Passing Interface (MPI),
which whould allow 'atltc' to run on distributed processors on a network
of computers. In order to do this, you needed to install the MPICH
library from 
http://www-unix.mcs.anl.gov/mpi/mpich/indexold.html

However, at the time of writing, This has been disabled and so there
is not a lot of point in configuring atlc for MPI support. MPI support
is a number one pririty now, so soon a better implementation will be
added to atlc. 


Note, if you want to play with atlc and MPI, 

1) An MPICH configured machine needs to be able to access at least one
machine on the network without a password, using .rhosts securtiy
procedures. THIS INCLUDES THE LOCAL HOST if you want to run on the local

3) ssh should work if MPICH is configured for this. which is must more 
secture than using .rhosts and rsh.

3) A small test program, in tests/MPI_16a_PI.c does build okay
and runs. If you uncommment the printf lines, it will 
give an estimage of PI. Hence the automake/autoconf and the 
macro m4/acx_mpi.m4 seems to be okay. 

Full MPI support is expected soon.