Index: trunk/zoo-project/zoo-services/gdal/contour/service.c
===================================================================
--- trunk/zoo-project/zoo-services/gdal/contour/service.c	(revision 758)
+++ trunk/zoo-project/zoo-services/gdal/contour/service.c	(revision 766)
@@ -388,5 +388,5 @@
                                  OGR_FD_GetFieldIndex( OGR_L_GetLayerDefn( hLayer ), 
                                                        pszElevAttrib ), 
-                         pfnProgress1, conf );
+				(GDALProgressFunc)pfnProgress1, conf );
 
     OGR_DS_Destroy( hDS );