fix declaration

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@36181 15284696-431f-4ddb-bdfa-cd5b030d7da7

raster/r.los/point.h

@@ -52,7 +52,12 @@ struct point *segment(int, int, int, double, double,
 	For delayed deletion of points (see delete3.c).
 	Initially set to NULL in main.c.
 */
+
+#ifdef MAIN
 struct point *DELAYED_DELETE;
+#else
+extern struct point *DELAYED_DELETE;
+#endif
 
 #endif