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Include <ctype.h> for toupper, isspace.  This avoids implicit function
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declarations and should improve compatibility with future compilers
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which default to stricter C99 mode.
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diff --git a/src/arg_int.c b/src/arg_int.c
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index 29c20e55cccb53ee..7145bb31c5dd8f90 100644
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--- a/src/arg_int.c
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+++ b/src/arg_int.c
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@@ -31,6 +31,8 @@ USA.
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 #include "argtable2.h"
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 #include <limits.h>
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+#include <ctype.h>
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+
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 /* local error codes */
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 enum {EMINCOUNT=1,EMAXCOUNT,EBADINT,EOVERFLOW};
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