diff --git a/make/defs-dirs.mk b/make/defs-dirs.mk
index f26f019e..45682b6d 100644
--- a/make/defs-dirs.mk
+++ b/make/defs-dirs.mk
@@ -2,7 +2,8 @@ FIND_SUBDIRS                := $(filter-out . .. nomake CVS $(IGNORE_SUBDIRS),\
 	$(patsubst ./%,%,$(patsubst %/,%,$(dir $(shell $(FIND) . -maxdepth 2 -mindepth 2 -a \( -iname Makefile -o -iname GNUmakefile \))))))
 SUBDIRS_TO_ITERATE           = $(filter-out $(IGNORE_SUBDIRS),$(SUBDIRS))
 
-ALLOWED_SUBDIR_TARGETS      ?= all install clean distclean test link-in
+EXTRA_SUBDIR_TARGETS        ?=
+ALLOWED_SUBDIR_TARGETS      ?= all install clean distclean test link-in $(EXTRA_SUBDIR_TARGETS)
 
 SUBDIRS                     ?= $(ORDERED_SUBDIRS) $(filter-out $(ORDERED_SUBDIRS),$(FIND_SUBDIRS))
 #SUBDIRS                    ?= $(filter-out $(ORDERED_SUBDIRS),$(FIND_SUBDIRS))