+define dl_tar_pack
+ $(TAR) --numeric-owner --owner=0 --group=0 --sort=name $$$${TAR_TIMESTAMP:+--mtime="$$$$TAR_TIMESTAMP"} -c $(2) | $(call dl_pack,$(1))
+endef
+
+ifdef CHECK
+check_escape=$(subst ','\'',$(1))
+#')
+
+# $(1): suffix of the F_, C_ variables, e.g. hash_deprecated, hash_mismatch, etc.
+# $(2): filename
+# $(3): expected hash value
+# $(4): var name of the the form: {PKG_,Download/<name>:}{,MIRROR_}{HASH,MIRROR_HASH}
+check_warn_nofix = $(info $(shell printf "$(_R)WARNING: %s$(_N)" '$(call check_escape,$(call C_$(1),$(2),$(3),$(4)))'))
+ifndef FIXUP
+ check_warn = $(check_warn_nofix)
+else
+ check_warn = $(if $(filter-out undefined,$(origin F_$(1))),$(filter ,$(shell $(call F_$(1),$(2),$(3),$(4)) >&2)),$(check_warn_nofix))
+endif
+
+gen_sha256sum = $(shell mkhash sha256 $(DL_DIR)/$(1))
+
+ifdef FIXUP
+F_hash_deprecated = $(SCRIPT_DIR)/fixup-makefile.pl $(CURDIR)/Makefile fix-hash $(3) $(call gen_sha256sum,$(1)) $(2)
+F_hash_mismatch = $(F_hash_deprecated)
+F_hash_missing = $(SCRIPT_DIR)/fixup-makefile.pl $(CURDIR)/Makefile add-hash $(3) $(call gen_sha256sum,$(1))
+endif
+
+# $(1): filename
+# $(2): expected hash value
+# $(3): var name of the the form: {PKG_,Download/<name>:}{,MIRROR_}{HASH,MIRROR_HASH}
+C_download_missing = $(1) is missing, please run make download before re-running this check
+C_hash_mismatch = $(3) does not match $(1) hash $(call gen_sha256sum,$(1))
+C_hash_deprecated = $(3) uses deprecated hash, set to $(call gen_sha256sum,$(1))
+C_hash_missing = $(3) is missing, set to $(call gen_sha256sum,$(1))
+
+# $(1): filename
+# $(2): expected hash value
+# $(3): var name of the the form: {PKG_,Download/<name>:}{,MIRROR_}{HASH,MIRROR_HASH}
+check_hash = \
+ $(if $(wildcard $(DL_DIR)/$(1)), \
+ $(if $(filter-out x,$(2)), \
+ $(if $(filter 64,$(shell printf '%s' '$(2)' | wc -c)), \
+ $(if $(filter $(2),$(call gen_sha256sum,$(1))),, \
+ $(call check_warn,hash_mismatch,$(1),$(2),$(3)) \
+ ), \
+ $(call check_warn,hash_deprecated,$(1),$(2),$(3)), \
+ ), \
+ $(call check_warn,hash_missing,$(1),$(2),$(3)) \
+ ), \
+ $(call check_warn,download_missing,$(1),$(2),$(3)) \
+ )
+
+ifdef FIXUP
+F_md5_deprecated = $(SCRIPT_DIR)/fixup-makefile.pl $(CURDIR)/Makefile rename-var $(2) $(3)
+endif
+
+C_md5_deprecated = Use of $(2) is deprecated, switch to $(3)
+
+check_md5 = \
+ $(if $(filter-out x,$(1)), \
+ $(call check_warn,md5_deprecated,$(1),$(2),$(3)) \
+ )
+
+hash_var = $(if $(filter-out x,$(1)),MD5SUM,HASH)
+endif