use ppp_defs.h instead of ppp.h, args.h; change some names
drwxr-xr-x - chat
drwxr-xr-x - include
drwxr-xr-x - linux
drwxr-xr-x - modules
drwxr-xr-x - pppd
drwxr-xr-x - pppstats
drwxr-xr-x - ultrix