Under UNIX SV we need to change include/irc.h and remove #include <arpa/inet.h> from the file. This causes a couple of new warnings in dcc.c to appear, but everything works as advertised. HPUX seems to have some header files problems. in particular. #include <sys/types.h> can't be included before #include <time.h> or #include <sys/time.h>