informix versions for linux?

Hi Folks, I'm new at Linux and Informix, and I'm trying to find out if I can get an updated version of IDS. However, I'm more confused than ever after getting off the phone with customer support. My situation: I currently have IDS.2000 9.20.UC1 (part of FOUNDATION.2000) which I'm trying to get running on RedHat Linux 6.2 (kernel 2.2.14-5 and glibc 2.1.3-15). Thanks to help from people on this list I worked around the NOAGE=1 bug and managed to get the server to start more than once. The bug is supposed to be fixed in 9.21.UC4, so I'd like to upgrade. I noticed a few things, however about product applicability regarding linux kernel and glibc versions: 1) the machine-specific notes for 9.20.UC1 (the version I have) say it's targeted to 2.2.5 and 2.1.1, respectively. They don't say "or higher." 2) IDS.2000 product information for Linux (http://www.informix.com/informix/resource/ids2000.htm#machine) shows only two versions - 9.21.UC2 and 9.20.UC1, no UC4! So how could the Linux-specific bug be fixed by a version that isn't available? Finally, 3) notes for 9.21.UC2 say it's targeted for kernel 2.2.12 or higher and glibc 2.1.2 or higher. So... Does that mean I Sincerley, matt