apue init

I'm finally trying some example programs from apue. When I try to compile hole.c with ourhdr.h in the same directory I see an "undefined reference to `err_sys'" error. This makes sense since I haven't defined the error functions. One solution is to replace them with printf. Since the apue site has error.c it's easy enough to just include that file. I'm working in a subdirectory I have for apue and with some slight modifications to hole.c:

:~/code/c/apue/ch3> diff hole.c hole.c.orig 
4,5c4
< #include      "../ourhdr.h"
< #include      "../error.c"
---
> #include      "ourhdr.h"
:~/code/c/apue/ch3>

I've got the example working on my Ubuntu system.