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-rw-r--r--ext/date/date_core.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ext/date/date_core.c b/ext/date/date_core.c
index 323a4550b2..51fb5c1d83 100644
--- a/ext/date/date_core.c
+++ b/ext/date/date_core.c
@@ -6,6 +6,9 @@
#include "ruby/encoding.h"
#include <math.h>
#include <time.h>
+#if defined(HAVE_SYS_TIME_H)
+#include <sys/time.h>
+#endif
#define NDEBUG
#include <assert.h>