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diff --git a/colour.h b/colour.h
index 5cb7b02..b1c6b14 100644
--- a/colour.h
+++ b/colour.h
@@ -1,34 +1,33 @@
-
-// colour.h
-
-#ifndef COLOUR_H
-#define COLOUR_H
-
-// includes
-
-#include "util.h"
-
-// constants
-
-const int BlackFlag = 1 << 0;
-const int WhiteFlag = 1 << 1;
-
-const int ColourNone = 0;
-const int Black      = BlackFlag;
-const int White      = WhiteFlag;
-const int ColourNb   = 3;
-
-// functions
-
-extern bool colour_is_ok    (int colour);
-
-extern bool colour_is_white (int colour);
-extern bool colour_is_black (int colour);
-extern bool colour_equal    (int colour_1, int colour_2);
-
-extern int  colour_opp      (int colour);
-
-#endif // !defined COLOUR_H
-
-// end of colour.h
-
+
+// colour.h
+
+#ifndef COLOUR_H
+#define COLOUR_H
+
+// includes
+
+#include "util.h"
+
+// defines
+
+#define BlackFlag (1 << 0)
+#define WhiteFlag (1 << 1)
+#define ColourNone 0
+#define Black BlackFlag
+#define White WhiteFlag
+#define ColourNb 3
+
+// functions
+
+extern bool colour_is_ok    (int colour);
+
+extern bool colour_is_white (int colour);
+extern bool colour_is_black (int colour);
+extern bool colour_equal    (int colour_1, int colour_2);
+
+extern int  colour_opp      (int colour);
+
+#endif // !defined COLOUR_H
+
+// end of colour.h
+