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-rw-r--r--ext/date/lib/interval.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ext/date/lib/interval.c b/ext/date/lib/interval.c
index c8200a48c3..af150fc802 100644
--- a/ext/date/lib/interval.c
+++ b/ext/date/lib/interval.c
@@ -19,6 +19,7 @@
/* $Id$ */
#include "timelib.h"
+#include <math.h>
timelib_rel_time *timelib_diff(timelib_time *one, timelib_time *two)
{