"as" is part of the gcc compiler suite. Did you install the entire suite, or just gfortran??? -b On 9/4/09 10:58 AM, "Mark Hibbeler" <markhibbeler@xxxxxxxxxxxx> wrote: > Hello, > > I installed the Fortran Compiler for Intel Based Mac on my Macbook pro running > Mac OS X 10.5.8 > > When I try to run a simple program from the terminal I receive the error > message below: > > gfortran: error trying to exec 'as': execvp: No such file or directory > > > Any ideas on what to do next? > > Mark