Changes by Amos Shapira <amos-efrat@gezernet.co.il>:

Summary of changes:

1. Moved the #include <netinet/in.h> before the #include of
   <arpa/inet.h>

2. cast 'community' to (char *) in a call to strcmp(3)

3. changed pdu_send 3rd argument type to 'u_char *' instead of 'char *'
   to comply with prototype decleration and the only place it is used.

4. added '-' in front of the calls to MKDIRHIER so make(1) ignores
   its failures
