The Linux binaries distribution (sac-101.1-linux_x86.tar.gz) was built on
CentOS 5. We found that when trying to open sac on a CentOS 4 machine, it
bombed. IRIS has replaced the Linux binary distribution with one built on
CentOS 4.5. This seems to work on CentOS 5 as well. Documentation
(Readme and History) files have been amended to reflect this change.