Add Windows global declaration for GvExitOnUsage

diff --git a/lib/gvc.def b/lib/gvc.def
index 38447538b029dde916c03c6515a0a8da3e9ee011..56682b7f28803f6e819c9338d89c4c86119c031a 100644 (file)
--- a/lib/gvc.def
+++ b/lib/gvc.def
@@ -129,6 +129,7 @@ gvcBuildDate
 gvcInfo    
 gvContext    
 gvcVersion    
+GvExitOnUsage
 Gvfilepath    
 gvFreeContext    
 gvFreeLayout    
@@ -350,4 +351,4 @@ EdgeLabelsDone
 get_gradient_points
 G_margin
 openIntSet
-GvExitOnUsage
\ No newline at end of file
+GvExitOnUsage