The ALMA team has released ACS 8.0 on Red Hat 4.4, downgrading the Linux version from the foreseen 5.2 version. This choice, with the consequent back-porting of the code to the older OS version, had to be taken because of major problems encountered by the Control and Correlator teams in porting RTAI real time code to Red Hat 5.2. As soon as these problems will be solved, ACS 8.0 will be released also for Red Hat 5.2. Report

These folks deliberately chose to base their work on a version of  software we developed that had somehow been transformed to have none of our copyright notices, ignored our complaints about their lack of interest in scientific integrity, and refused to even discuss a commercial solution with the inventors, and have by now invested untold amounts of public money trying to keep the mess working.