Hello, I have a multi-threaded program that seems to run well on my Solaris box but I can't port it to the AIX server that I need it to run on. The compilers are configured different i.e. the one on Solaris is configured to the POSIX standard and the one on the AIX box is AIX specific. I talked with my Unix Admin about reloading it configured to the POSIX standard but he would have none of that. I know they are completely different operating systems in almost every way but I was hoping to port the code. Biggest problem I have with the AIX box is symbol not found for create_pthread. The funny thing about that is that the compiler will show me errors when the call has bad syntax. As soon as it has the correct syntax then I get the symbol not found. I tried two specific things, (1) putting the pthread.h as the first include file, (2) compiling the code with the -phreads option. Any words of advice from the community? Like for instance does someone know if this can even work? Regards, Jen Jennifer L Mead ICC Operations Sr Sys Engineer Con-way Enterprise Services 503.450.8578 desk 503.550.6589 cell mead.jennifer@xxxxxxxxxxxxx