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-rw-r--r--css/ruleset.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/css/ruleset.c b/css/ruleset.c
index 92686a384..092190f9a 100644
--- a/css/ruleset.c
+++ b/css/ruleset.c
@@ -35,6 +35,7 @@
#include <stdlib.h>
#include <string.h>
#include <strings.h>
+#include <math.h>
#define CSS_INTERNALS
#define NDEBUG
#include "css/css.h"