i did a google search for it and found this: http://pubs.opengroup.org/onlinepubs/007904975/basedefs/sys/wait.h.html
which stated: "The id_t and pid_t types shall be defined as described in <sys/types.h>." and also looked in openbsd's <sys/wait.h> which did #include <sys/types.h> which was good enougth for me, tho i'm not a unix expert. -- cinap
