Hi, This is actually a bug report/question about CLN, not ginac. I tried sending an email to richard.krekel@ginac.de, but I received a response from "System Administrator" saying that the email was undeliverable. I first installed gmp, and then CLN, and everything installed fine. The CLN demos fibonacci and nextprime worked great, and the legendre polynomial demo works when I give it one argument. However, when I give it the second optional argument, it always results in a "Segmentation fault". Is there something I did wrong, or is there a known problem in the demo program? (I should have written down the versions of all the relevant software--CLN, gmp, my compilers, etc. Unfortunately, I am in my office right now, and the computer on which I installed the software is at home. I downloaded gmp and CLN just a few days ago, so they are the latest versions.) I'm looking forward to trying ginac. Thanks for sharing it with the rest of the world! Best regards, Warren Warren Weckesser Department of Mathematics Office: 314 McGregory Colgate University Phone: (315) 228-7228 Hamilton, NY 13346 Email: WWeckesser@mail.colgate.edu