--- clean_exit.c
+++ clean_exit.c
@@ -13,6 +13,8 @@
 #endif
 
 #include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
 
 extern void exit();
 
--- hosts_access.c
+++ hosts_access.c
@@ -31,6 +31,8 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <netdb.h>
 #include <syslog.h>
 #include <ctype.h>
 #include <errno.h>
--- inetcf.c
+++ inetcf.c
@@ -88,7 +88,7 @@
     } else {
 	for (i = 0; inet_files[i] && (fp = fopen(inet_files[i], "r")) == 0; i++)
 	     /* void */ ;
-	if (fp == 0) {
+	if (!fp) {
 	    fprintf(stderr, "Cannot find your inetd.conf or tlid.conf file.\n");
 	    fprintf(stderr, "Please specify its location.\n");
 	    exit(1);
--- ip6utils.c
+++ ip6utils.c
@@ -2,6 +2,7 @@
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <stdio.h>
+#include <string.h>
 #include <errno.h>
 
 #include "ip6utils.h"
--- options.c
+++ options.c
@@ -41,6 +41,8 @@
 #include <netinet/in.h>
 #include <netdb.h>
 #include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
 #include <syslog.h>
 #include <pwd.h>
 #include <grp.h>
--- percent_x.c
+++ percent_x.c
@@ -18,6 +18,8 @@
 
 #include <stdio.h>
 #include <syslog.h>
+#include <stdlib.h>
+#include <unistd.h>
 #include <string.h>
 
 extern void exit();
--- shell_cmd.c
+++ shell_cmd.c
@@ -15,9 +15,13 @@
 /* System libraries. */
 
 #include <sys/types.h>
+#include <sys/wait.h>
 #include <sys/param.h>
 #include <signal.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
 #include <syslog.h>
 #include <string.h>
 
--- update.c
+++ update.c
@@ -21,6 +21,7 @@
 
 #include <stdio.h>
 #include <syslog.h>
+#include <unistd.h>
 #include <string.h>
 
 /* Local stuff. */