diff --git a/pmc/include/vector.h b/pmc/include/vector.h
--- a/pmc/include/vector.h
+++ b/pmc/include/vector.h
@@ -14,6 +14,7 @@
         enum Mode { DEG, RAD, GRAD };
 
         Vector (int xx = 0, int yy = 0);
+        Vector (const Vector &);
         virtual ~ Vector ();
 
         int X ();
@@ -29,6 +30,7 @@
 
       private:
         Mode mode;
+
         int x;
         int y;
     };