On Mon, 30 Oct 2000 10:43:16 +1030 (CST) you wrote: >ImportError: ./PoPymodule.so: Undefined symbol "sem_wait" Take a look at the man page for sem_wait(). Take the library/libraries listed there and put them on the configure line for PoPy. In my case (Solaris 2.6), I added "--with-libs=-lposix4". It'd be nice if PoPy would do this on its own. --kyler