+ifdef CHECK
+check_escape=$(subst ','\'',$(1))
+#')
+check_warn = $(info $(shell printf "$(_R)WARNING: %s$(_N)" '$(call check_escape,$(call C_$(1),$(2),$(3),$(4)))'))
+gen_sha256sum = $(shell openssl dgst -sha256 $(DL_DIR)/$(1) | awk '{print $$2}')
+
+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))
+
+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)) \
+ )
+
+C_md5_deprecated = Use of $(2) is deprecated, switch to $(3)
+
+# Skip MD5SUM check in feeds until OpenWrt is updated
+ifneq ($(filter $(foreach dir,package tools toolchain, $(TOPDIR)/$(dir)/%),$(CURDIR)),)
+check_md5 = \
+ $(if $(filter-out x,$(1)), \
+ $(call check_warn,md5_deprecated,$(1),$(2),$(3)) \
+ )
+endif
+
+hash_var = $(if $(filter-out x,$(1)),MD5SUM,HASH)
+endif
+