This installation doesn't support glibc-2.1 on x86_64

I went to install some games I had on my old box, railroad tycoon and SOF to be precise (Civilization was next). In both cases I got the following error message. This installation doesn't support glibc-2.1 on x86_64 Are the few decent linux based games I have toast, or can I salvage this mess? -- Dr. Roy F. Cabaniss Associate Professor of Marketing University of Arkansas Monticello