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--- a/main.c 1995-08-11 02:00:00.000000000 +0200 +++ b/main.c 2010-08-26 23:57:03.000000000 +0200 @@ -91,6 +91,7 @@ #include <stdio.h> #include <stdlib.h> +#include <unistd.h> #include <string.h> #include <ctype.h> #include "pep.h"