stdlib for malloc

src/Canvas.h

@@ -69,4 +69,4 @@ class Canvas: public node::ObjectWrap {
     cairo_surface_t *_surface;
 };
 
-#endif
+#endif

src/CanvasRenderingContext2d.cc

@@ -7,6 +7,7 @@
 
 #include <math.h>
 #include <string.h>
+#include <stdlib.h>
 #include "Canvas.h"
 #include "CanvasRenderingContext2d.h"
 #include "CanvasGradient.h"