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-rw-r--r--extra/innochecksum.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/extra/innochecksum.c b/extra/innochecksum.c
index 739953298af..bae5f3e8821 100644
--- a/extra/innochecksum.c
+++ b/extra/innochecksum.c
@@ -28,6 +28,8 @@
#define _LARGEFILE_SOURCE
#define _LARGEFILE64_SOURCE
+#define _XOPEN_SOURCE /* needed to include getopt.h on some platforms. */
+
#include <stdio.h>
#include <stdlib.h>
#include <time.h>