--- /dev/null
+#ifndef ENT_CHALLENGE_H
+#define ENT_CHALLENGE_H
+
+#include "entity.h"
+
+VG_STATIC void ent_challenge_preupdate( ent_challenge *challenge );
+VG_STATIC void ent_challenge_call( world_instance *world, ent_call *call );
+
+#endif /* ENT_CHALLENGE_H */