CrossWorks build errors targeted for Atmel AT91SAM9260 and Linux Ubuntu.

I have CrossWorks targeted for an Atmel AT91SAM9260 processor running on a Linux Unbuntu laptop. The Hello World program I created is a vanilla C program and it builds and successfully runs via the debugger on the target using a SEGGAR JTAG. The target OS is also Ubuntu Linux. I added "#include <pthread.h>" to the Hello World main.c and I get compile errors. How can I build for an Atmel AT91SAM9260 that will run in a Linux environment on the target. I assume a Linux library with .so (shared object) files will be needed.

Any help is greatly appreciated.

Regards and Cheers.