tree.tag:
		mkdir -p build
		mkdir -p build/gen
		mkdir -p build/gen/ir
		mkdir -p build/gen/ir/ir
		mkdir -p build/gen/include
		mkdir -p build/gen/include/libfirm
		mkdir -p build/gen/ir/be
		mkdir -p build/gen/ir/be/arm
		mkdir -p build/gen/ir/be/amd64
		mkdir -p build/gen/ir/be/ia32
		mkdir -p build/gen/ir/be/sparc
		mkdir -p build/gen/ir/be/TEMPLATE
		touch tree.tag