I don't know much about packaging but I guess the reason is that
nobody prepared
the 64 bit package "yet". So, I don't see a reason for GNU
Smalltalk not to work
on 64 bit systems when you compile it.
Though, I don't think that converting all of your Ruby
administration scripts
into GST is a good idea. GST is not as stable as Ruby or does not
have extra
libraries as much as Ruby has etc... Maybe you should first try some
experimental administration scripts and convert the rest if you are
satisfied.
I tested them all on a 32 bit system a couple weeks back and had no
issues
but, thanks for the advice.