64 bit?

I have struggled for some time to install Smartlist on a newer machine (RH linux) but fails. The same install process works on older machines). The diagnoses seem to point to the shell (sh -> bash) problems/versions. Now we realize this new machine is 64 bit -- Is there a 64-bit Smartlist source codes available, or the current code is already 64-bit compatible? Thanks, Zhiliang