You require the glibc 2.2 package and gcc-2.95.3 as well since ttsynth needs standard libraries in those packages. If you want to build those you'll have to dig up all the appropriate patches and fixes for that to happen. Why people would have us run deprecated software I have no idea. Ttsynth needs to be updated to be at all useful. My advice to you is to complain to the appropriate people and get a refund. If you choose to go looking for the patches and fixes required to build the older glibc and gcc then good luck. I recommend against it though if you want to keep your sanity.