Fix build error on mac.

diff --git a/src/wx/screens_panel.h b/src/wx/screens_panel.h
index 9c9811c1d0de7fa83d224896216b514410a7364c..1eff50a59b21833f5a33b4a0ce8bdc3007ce271d 100644 (file)
--- a/src/wx/screens_panel.h
+++ b/src/wx/screens_panel.h
@@ -37,7 +37,7 @@ namespace dcpomatic {
 
 
 class Cinema;
-class UCollator;
+struct UCollator;
 
 
 class ScreensPanel : public wxPanel