-void lcp_init __ARGS((int));
-void lcp_open __ARGS((int));
-void lcp_close __ARGS((int));
-void lcp_lowerup __ARGS((int));
-void lcp_lowerdown __ARGS((int));
-void lcp_input __ARGS((int, u_char *, int));
-void lcp_protrej __ARGS((int));
-void lcp_sprotrej __ARGS((int, u_char *, int));
-int lcp_printpkt __ARGS((u_char *, int,
- void (*) __ARGS((void *, char *, ...)), void *));
+void lcp_open __P((int));
+void lcp_close __P((int, char *));
+void lcp_lowerup __P((int));
+void lcp_lowerdown __P((int));
+void lcp_sprotrej __P((int, u_char *, int)); /* send protocol reject */