--- prctl.c
+++ prctl.c
@@ -55,12 +55,12 @@
 /* Verbose mode */
 int verbose=0;
 
-print_version(char *progname)
+void print_version(char *progname)
 {
 	printf("%s version %s\n", progname, VERSION);
 }
 
-usage(char *progname)
+void usage(char *progname)
 {
 	print_version(progname);
 	printf("Usage: %s [-v] [-h|--help] [--version]\n", progname);
@@ -355,4 +355,5 @@
 			exit(1);
 		}
 	}
+	abort();
 }