--- src/util.hpp~	2019-06-17 20:37:00.385205973 +0200
+++ src/util.hpp	2019-06-17 20:35:28.356211305 +0200
@@ -13,6 +13,7 @@
 #include <string>
 #include <assert.h>
 #include <math.h>
+#include <cmath>
 
 #define SASS_ASSERT(cond, msg) assert(cond && msg)