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-rw-r--r--src/zsetu.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/zsetu.c b/src/zsetu.c
index dd1be17..c3c3510 100644
--- a/src/zsetu.c
+++ b/src/zsetu.c
@@ -1,6 +1,8 @@
/* See LICENSE file for copyright and license details. */
#include "internals"
+#include <stdlib.h>
+
#define SIZE_MULTIPLE(fit, in) ((sizeof(fit) + sizeof(in) - 1) / sizeof(in))