If your system's having problems finding the fortran compiler, try
> ./configure F77=gfortran
> make
for the gfortran compiler (replace with the name of the one you want to use, eg ifort, g77-34 etc).
Alternatively, if you prefer, try the old school makefile: drop it into your SOFTSUSY directory, edit the C++ and fortran compiler entries and just do a
> make
Good luck!
There has been a report on a new mac that the C++ automatically compiles with 64-bit, whereas fortran compiles in 32-bit architecture. Passing -m64 to fortran (or -m32 to C++) should sort this problem out. Thanks to James Wells for this report.