Greetings, The largest problem with running under a non-Debian-based distribution of Linux, such as RedHat variants, is support. The first headache you will encounter is installing the required libraries. Last I checked, it was around 18 or so of them require installation magic beyond a default installation on CentOS and/or Fedora. The second headache you will encounter is when you hit a problem, you may discover it is because of your non-Debian OS, because they did it differently that what the coders of Koha encountered using Debian-based OSes. Additionally, you may find only a few of people who use RedHat to run it, and they may or may not respond in a timely fashion to your problems. Debian, in particular, and Debian-based variations (Ubuntu is another popular one) are your best bet for finding support, and having a less painful installation. So is RedHat discouraged? Yes, why would we encourage headaches which we generally don't have the time to solve, because we mostly use Debian-based OSes? However, we believe in freedom, and if you wish to take on the mantle of pain, feel free. More power to you. :) For a more painful experience port it to run natively in Windows. ;) GPML, Mark Tompsett P.S. I did actually attempt the Windows, but gave up because the pain was worse than CentOS and Fedora. I only attempted them to see if it could be done, and yes, I was successful eventually. I don't recommend trying, unless you are seasoned Linux administrator.