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-rw-r--r--timezone/zdump.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/timezone/zdump.c b/timezone/zdump.c
index 659f572b98..d767d75fb7 100644
--- a/timezone/zdump.c
+++ b/timezone/zdump.c
@@ -12,6 +12,7 @@ static char elsieid[] = "@(#)zdump.c 7.66";
#include "time.h" /* for struct tm */
#include "stdlib.h" /* for exit, malloc, atoi */
#include "float.h" /* for FLT_MAX and DBL_MAX */
+#include <ctype.h> /* for isascii, isalpha, isdigit */
#ifndef ZDUMP_LO_YEAR
#define ZDUMP_LO_YEAR (-500)