warning: implicit declaration of function 'getpid'
warning: implicit declaration of function 'strlen'
warning: implicit declaration of function 'strcmp'
warning: implicit declaration of function 'strncmp'

--- lib/getopt.c.orig	Wed Mar  3 00:14:45 1999
+++ lib/getopt.c	Sat May  2 14:49:21 2015
@@ -30,6 +30,9 @@
 #include <config.h>
 #endif
 
+#include <string.h>
+#include <unistd.h>
+
 #if !defined (__STDC__) || !__STDC__
 /* This is a separate conditional since some stdc systems
    reject `defined (const)'.  */