I chased it down.
I had to manually install three items to eliminate the issue...
perl-Compress-Zlib
perl-IO-Zlib
perl-Archive-Tar.noarch 0:1.26-1.2.el4.rf
It was interesting to see the number of replies I found using Google to this exact issue, across multiple platforms, etc.
But, the sa-learn command now performs as expected.
Thanks for the help.
regards,
patrick