fixed ncurses output attributes

src/constants.h

@@ -1,6 +1,7 @@
 #ifndef __CONSTANTS_H__
 #define __CONSTANTS_H__
 #include <vector>
+#include <ncurses.h>
 #include "position.h"
 
 // IMPORTANT: panic is reserved for invalid results
@@ -89,6 +90,8 @@ const feature FEATURE_LIST_ARGS     = 1 << 31;
 const int RETURN_FINE     = 0;
 const int RETURN_PANICKED = 1;
 
+const int COLOR_BLACK_ON_WHITE = 8;
+
 typedef std::vector<position> position_list;
 typedef std::vector<direction> direction_list;