/* #define DEBUG */
#include "libavutil/eval.h"
+#include "libavutil/mathematics.h"
#include "avfilter.h"
-static const char *var_names[] = {
+static const char *const var_names[] = {
"E", ///< Euler number
"INTERLACED", ///< tell if the current frame is interlaced
"N", ///< frame number (starting at zero)