The following usage example compiles xyz.f and creates the
executable file foo:
fort77 -o foo xyz.f
The following example compiles xyz.f and creates the object file
xyz.o:
fort77 -c xyz.f
The following example compiles xyz.f and creates the executable
file a.out:
fort77 xyz.f
The following example compiles xyz.f, links it with b.o, and
creates the executable a.out:
fort77 xyz.f b.o
