gfortran versus g77 with Linux binary packages

I just downloaded the Linux binary NCARG/NCL packages for "gcc4" -- both
the 32-bit package for i686 and the 64-bit package for x86_64 (I have
both kinds of machines currently running CentOS 5.2). I was surprised
to discover that the ncargf77 and ncargf90 scripts in the 32-bit package
were both using the g77 compiler (which I thought was "gcc3" not "gcc4")
instead of the gfortran compiler. These same two scripts in the 64-bit
package both use the gfortran compiler as expected. I would like to use
the gfortran compiler on both kinds of machines.

(1) I can understand why the g77 compiler would be used for the "gcc3"
packages, but why was it used for the 32-bit "gcc4" package?
(2) Can the gfortran compiler be used with the 32-bit "gcc4" binary
package? How?

Thanks for your help!

Rick

-- 
========================================================================
Rick Taft                                          Research Associate IV
------------------------------------------------------------------------
    320 Atmospheric Science         Email:  taft_at_atmos.colostate.edu
    Foothills Campus                Phone:  970-491-2347
    Colorado State University
    Fort Collins, CO  80523-1371
========================================================================
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