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diff -up dos2unix-3.1/dos2unix.c.missing-proto dos2unix-3.1/dos2unix.c
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--- dos2unix-3.1/dos2unix.c.missing-proto	2008-04-14 17:11:58.000000000 +0100
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+++ dos2unix-3.1/dos2unix.c	2008-04-14 17:12:42.000000000 +0100
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@@ -75,6 +75,11 @@ static int macmode = 0;
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 #include <string.h>
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 #include <utime.h>
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 #include <sys/stat.h>
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+#if defined(__MSDOS__) || defined(__WIN32__) || defined(_WIN32)
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+#  include <io.h>
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+#else
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+#  include <unistd.h>
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+#endif
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 #include "dos2unix.h"
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