The GNU Fortran compiler is called g77.
We also have the Sun Fortran compiler f77. To compile and link
a program called runge.f with all the default options, use the
g77 runge.f -o runge
If there are coding errors, you will see a list of error messages and
an indication of the source code line number where the error
To compile and link with the LAPACK library, use
g77 runge.f -o runge -llapack