Hi Chuck: The pthread it is talking about is posix threads. If you have it you will find it in /usrlib with a file name of libpthread*. It is usually part of distributions development code so you should have it but with slackware, who knows. Kirk -- Kirk Reiser The Computer Braille Facility e-mail: kirk at braille.uwo.ca University of Western Ontario phone: (519) 661-3061