Fortran interfacing

["C. Maple" <crm2@mcs.le.ac.uk>]

Can anybody tell me how to EXPORT from Ada to fortran.  I have 
a large program written in fortran and wish to include it in an Ada 
program.  I think I can manage the import quite easily (there are 
plenty of examples around, and I have managed on a test program), 
but I cannot manage the export (there are NO examples I can find and 
I can't manage a test program).

If someone could write/ or explain how I could write, a small test 
program that called a Fortran subroutine that in turn called an Ada 
program I would be very grateful.  

Thanks,
Carsten.