--- /dev/null
+# -*- makefile -*-
+
+ifeq ($(ARCH),)
+CONFIG_MISSING += ARCH
+endif
+ifeq ($(MACH),)
+CONFIG_MISSING += MACH
+endif
+ifeq ($(BOARD),)
+CONFIG_MISSING += BOARD
+endif
+ifneq ($(CONFIG_MISSING),)
+$(warning Missing variables: $(CONFIG_MISSING))
+$(error Please provide an appropriate config.target from a board directory)
+endif
+
+SUBDIRS = $(ALL_OMK_SUBDIRS)