-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 */
+void lcp_open(int);
+void lcp_close(int, char *);
+void lcp_lowerup(int);
+void lcp_lowerdown(int);
+void lcp_sprotrej(int, u_char *, int); /* send protocol reject */