--- a/ui/cocoa/objs.mk	Sat May 17 10:53:57 2014 +0200
+++ b/ui/cocoa/objs.mk	Mon May 19 15:54:58 2014 +0200
@@ -37,6 +37,7 @@
 COCOAOBJ += container.o
 COCOAOBJ += text.o
 COCOAOBJ += resource.o
+COCOAOBJ += tree.o
 
 
 TOOLKITOBJS = $(COCOAOBJ:%=$(COCOA_OBJPRE)%)