We recommend using the egcs (including g77) for compiling codes.
Source:
http://egcs.cygnus.com
Version: egcs-1.1.1 gzip format
Once compiled and installed, the egcs compilers should reside
in /usr/local. In this way users ican set their path
to point to the appropriate versions (i.e. standard gcc is
in /usr/bin while egcs gcc is in /usr/local/bin)
Note: use gcc (not egcs gcc) to build kernels.
gcc -v and which gcc can tell you which versions you
are using.
g77 is the egcs FORTRAN compiler.