--- rfc931.c.orig
+++ rfc931.c
@@ -23,7 +23,7 @@ static char sccsid[] = "@(#) rfc931.c 1.
 #include <setjmp.h>
 #include <signal.h>
 #include <string.h>
-
+#include <unistd.h>
 /* Local stuff. */
 
 #include "tcpd.h"
--- safe_finger.c.orig
+++ safe_finger.c
@@ -19,13 +19,16 @@ static char sccsid[] = "@(#) safe_finger
 #endif
 
 /* System libraries */
-
+#include <stdlib.h>
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
+#include <sys/wait.h>
 #include <signal.h>
 #include <stdio.h>
 #include <ctype.h>
 #include <pwd.h>
+#include <fcntl.h>
 
 extern void exit();
 
--- tcpdchk.c.orig
+++ tcpdchk.c
@@ -20,6 +20,7 @@ static char sccsid[] = "@(#) tcpdchk.c 1
 
 /* System libraries. */
 
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #ifdef INET6
@@ -33,6 +34,7 @@ static char sccsid[] = "@(#) tcpdchk.c 1
 #include <errno.h>
 #include <netdb.h>
 #include <string.h>
+#include <unistd.h>
 
 extern int errno;
 extern void exit();
--- tcpdmatch.c.orig
+++ tcpdmatch.c
@@ -19,6 +19,7 @@ static char sccsid[] = "@(#) tcpdmatch.c
 
 /* System libraries. */
 
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <sys/socket.h>
@@ -29,6 +30,7 @@ static char sccsid[] = "@(#) tcpdmatch.c
 #include <syslog.h>
 #include <setjmp.h>
 #include <string.h>
+#include <unistd.h>
 
 extern void exit();
 extern int optind;