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--- complex.c.orig 2002-04-04 05:46:10.000000000 +0200 +++ complex.c 2013-11-05 16:40:36.000000000 +0100 @@ -21,6 +21,7 @@ Foundation, Inc., 59 Temple Place - Suit #include <stdio.h> #include <stdlib.h> +#include <string.h> #include <math.h> #include "complex.h"