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diff -urN flow-tools-0.68/src/flow-header.c flow-tools-0.68.s/src/flow-header.c
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--- flow-tools-0.68/src/flow-header.c	2003-04-02 22:03:02.000000000 +0400
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+++ flow-tools-0.68.s/src/flow-header.c	2007-03-24 23:35:30.000000000 +0300
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@@ -32,6 +32,7 @@
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 #include <stdio.h>
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 #include <stdlib.h>
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+#include <unistd.h>
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 void usage(void);
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