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# include/depends.mk
# define a dependency on a subtree
# parameters:
#       1: directory
#       2: directory dependency
#       3: find options

define rdep
  $(foreach file,$(shell find $(1) -type f -not -name .\* -and -not -path \*.svn\* $(3)),
    $(2): $(file)
  )

  ifneq ($(shell find $(1) -type f -not -name .\* -and -not -path \*.svn\* $(3) | md5s),$(shell cat $(1)/.dep_files))
    $(2): $(1)/.dep_files
  endif
  
  $(1)/.dep_files: FORCE
        @find $(1) -type f -not -name .\* -and -not -path \*.svn\* $(3) | md5s > $$@
endef


------ in include/package.mk
  $(call rdep,${CURDIR},$(STAMP_PREPARED))