diff --git a/project/tree.mk b/project/tree.mk
index c23b423..775ae53 100644
--- a/project/tree.mk
+++ b/project/tree.mk
@@ -11,4 +11,24 @@ tree.tag:
 		mkdir -p build/gen/ir/be/ia32
 		mkdir -p build/gen/ir/be/sparc
 		mkdir -p build/gen/ir/be/TEMPLATE
+		mkdir -p ir/be/arm
+		mkdir -p ir/be/amd64
+		mkdir -p ir/be/ia32
+		mkdir -p ir/be/sparc
+		mkdir -p ir/be/TEMPLATE
+		mkdir -p ir/adt
+		mkdir -p ir/ana
+		mkdir -p ir/be
+		mkdir -p ir/common
+		mkdir -p ir/ident
+		mkdir -p ir/ir
+		mkdir -p ir/kaps
+		mkdir -p ir/libcore
+		mkdir -p ir/lower
+		mkdir -p ir/lpp
+		mkdir -p ir/obstack
+		mkdir -p ir/opt
+		mkdir -p ir/stat
+		mkdir -p ir/tr
+		mkdir -p ir/tv
 		touch tree.tag