build: introduce $(MKHASH)

Before this commit, it was assumed that mkhash is in the PATH. While
this was fine for the normal build workflow, this led to some issues if

    make TOPDIR="$(pwd)" -C "$pkgdir" compile

was called manually. In most of the cases, I just saw warnings like this:

    make: Entering directory '/home/.../package/gluon-status-page'
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    bash: line 1: mkhash: command not found
    [...]

While these were only warnings and the package still compiled sucessfully,
I also observed that some package even fail to build because of this.

After applying this commit, the variable $(MKHASH) is introduced. This
variable points to $(STAGING_DIR_HOST)/bin/mkhash, which is always the
correct path.

Signed-off-by: Leonardo Mörlein <me@irrelefant.net>

25 files changed, 40 insertions, 39 deletions

diff --git a/include/depends.mk b/include/depends.mk
index 0080b97876..465e4e952a 100644
--- a/include/depends.mk
+++ b/include/depends.mk
@@ -11,7 +11,7 @@
 
 DEP_FINDPARAMS := -x "*/.svn*" -x ".*" -x "*:*" -x "*\!*" -x "* *" -x "*\\\#*" -x "*/.*_check" -x "*/.*.swp" -x "*/.pkgdir*"
 
-find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -printf "%p%T@\n" | sort | mkhash md5
+find_md5=find $(wildcard $(1)) -type f $(patsubst -x,-and -not -path,$(DEP_FINDPARAMS) $(2)) -printf "%p%T@\n" | sort | $(MKHASH) md5
 
 define rdep
   .PRECIOUS: $(2)
diff --git a/include/download.mk b/include/download.mk
index 4bf055e611..609956b004 100644
--- a/include/download.mk
+++ b/include/download.mk
@@ -74,7 +74,7 @@ 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))
+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)
diff --git a/include/image-commands.mk b/include/image-commands.mk
index afb2dde5ba..fa36885038 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -198,7 +198,7 @@ define Build/elx-header
 			dd bs=20 count=1 conv=sync; \
 		echo -ne "$$(printf '%08x' $$(stat -c%s $@) | fold -s2 | xargs -I {} echo \\x{} | tr -d '\n')" | \
 			dd bs=8 count=1 conv=sync; \
-		echo -ne "$$($(STAGING_DIR_HOST)/bin/mkhash md5 $@ | fold -s2 | xargs -I {} echo \\x{} | tr -d '\n')" | \
+		echo -ne "$$($(MKHASH) md5 $@ | fold -s2 | xargs -I {} echo \\x{} | tr -d '\n')" | \
 			dd bs=58 count=1 conv=sync; \
 	) > $(KDIR)/tmp/$(DEVICE_NAME).header
 	$(call Build/xor-image,-p $(xor_pattern) -x)
diff --git a/include/image.mk b/include/image.mk
index 76c527a15e..d93ce7f233 100644
--- a/include/image.mk
+++ b/include/image.mk
@@ -26,7 +26,7 @@ param_get_default = $(firstword $(call param_get,$(1),$(2)) $(3))
 param_mangle = $(subst $(space),_,$(strip $(1)))
 param_unmangle = $(subst _,$(space),$(1))
 
-mkfs_packages_id = $(shell echo $(sort $(1)) | mkhash md5 | cut -b1-8)
+mkfs_packages_id = $(shell echo $(sort $(1)) | $(MKHASH) md5 | cut -b1-8)
 mkfs_target_dir = $(if $(call param_get,pkg,$(1)),$(KDIR)/target-dir-$(call param_get,pkg,$(1)),$(TARGET_DIR))
 
 KDIR=$(KERNEL_BUILD_DIR)
@@ -40,8 +40,8 @@ IMG_PREFIX_VERCODE:=$(if $(CONFIG_VERSION_CODE_FILENAMES),$(call sanitize,$(VERS
 IMG_PREFIX:=$(VERSION_DIST_SANITIZED)-$(IMG_PREFIX_VERNUM)$(IMG_PREFIX_VERCODE)$(IMG_PREFIX_EXTRA)$(BOARD)$(if $(SUBTARGET),-$(SUBTARGET))
 IMG_ROOTFS:=$(IMG_PREFIX)-rootfs
 IMG_COMBINED:=$(IMG_PREFIX)-combined
-IMG_PART_SIGNATURE:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | mkhash md5 | cut -b1-8)
-IMG_PART_DISKGUID:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | mkhash md5 | sed -E 's/(.{8})(.{4})(.{4})(.{4})(.{10})../\1-\2-\3-\4-\500/')
+IMG_PART_SIGNATURE:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | $(MKHASH) md5 | cut -b1-8)
+IMG_PART_DISKGUID:=$(shell echo $(SOURCE_DATE_EPOCH)$(LINUX_VERMAGIC) | $(MKHASH) md5 | sed -E 's/(.{8})(.{4})(.{4})(.{4})(.{10})../\1-\2-\3-\4-\500/')
 
 MKFS_DEVTABLE_OPT := -D $(INCLUDE_DIR)/device_table.txt
 
diff --git a/include/kernel-defaults.mk b/include/kernel-defaults.mk
index 4b0b136a03..82bc32256d 100644
--- a/include/kernel-defaults.mk
+++ b/include/kernel-defaults.mk
@@ -116,7 +116,7 @@ define Kernel/Configure/Default
 		cp $(LINUX_DIR)/.config.set $(LINUX_DIR)/.config.prev; \
 	}
 	$(_SINGLE) [ -d $(LINUX_DIR)/user_headers ] || $(KERNEL_MAKE) INSTALL_HDR_PATH=$(LINUX_DIR)/user_headers headers_install
-	grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | mkhash md5 > $(LINUX_DIR)/.vermagic
+	grep '=[ym]' $(LINUX_DIR)/.config.set | LC_ALL=C sort | $(MKHASH) md5 > $(LINUX_DIR)/.vermagic
 endef
 
 define Kernel/Configure/Initramfs
@@ -186,5 +186,3 @@ define Kernel/Clean/Default
 	rm -f $(LINUX_KERNEL)
 	$(_SINGLE)$(MAKE) -C $(KERNEL_BUILD_DIR)/linux-$(LINUX_VERSION) clean
 endef
-
-
diff --git a/include/package-ipkg.mk b/include/package-ipkg.mk
index c2017cd220..b066e116f7 100644
--- a/include/package-ipkg.mk
+++ b/include/package-ipkg.mk
@@ -221,7 +221,7 @@ $(_endef)
     ifneq ($$(CONFIG_IPK_FILES_CHECKSUMS),)
 	(cd $$(IDIR_$(1)); \
 		( \
-			find . -type f \! -path ./CONTROL/\* -exec mkhash sha256 -n \{\} \; 2> /dev/null | \
+			find . -type f \! -path ./CONTROL/\* -exec $(MKHASH) sha256 -n \{\} \; 2> /dev/null | \
 			sed 's|\([[:blank:]]\)\./| \1/|' > $$(IDIR_$(1))/CONTROL/files-sha256sum \
 		) || true \
 	)
diff --git a/include/quilt.mk b/include/quilt.mk
index 00597ca0f2..6d25469daf 100644
--- a/include/quilt.mk
+++ b/include/quilt.mk
@@ -159,7 +159,7 @@ define Quilt/Template
 		false; \
 	}
 	@[ -n "$$$$(ls $(1)/patches/series)" -o \
-	   "$$$$(cat $(1)/patches/series | mkhash md5)" = "$$(sort $(1)/patches/series | mkhash md5)" ] || { \
+	   "$$$$(cat $(1)/patches/series | $(MKHASH) md5)" = "$$(sort $(1)/patches/series | $(MKHASH) md5)" ] || { \
 		echo "The patches are not sorted in the right order. Please fix."; \
 		false; \
 	}
diff --git a/include/scan.mk b/include/scan.mk
index 7df5dc6486..aee24cb3e5 100644
--- a/include/scan.mk
+++ b/include/scan.mk
@@ -1,4 +1,5 @@
 include $(TOPDIR)/include/verbose.mk
+include $(TOPDIR)/rules.mk
 TMP_DIR:=$(TOPDIR)/tmp
 
 all: $(TMP_DIR)/.$(SCAN_TARGET)
@@ -100,7 +101,7 @@ $(TMP_DIR)/info/.files-$(SCAN_TARGET).mk: $(FILELIST)
 $(TARGET_STAMP)::
 	+( \
 		$(NO_TRACE_MAKE) $(FILELIST); \
-		MD5SUM=$$(cat $(FILELIST) $(OVERRIDELIST) | mkhash md5 | awk '{print $$1}'); \
+		MD5SUM=$$(cat $(FILELIST) $(OVERRIDELIST) | $(MKHASH) md5 | awk '{print $$1}'); \
 		[ -f "$@.$$MD5SUM" ] || { \
 			rm -f $@.*; \
 			touch $@.$$MD5SUM; \
diff --git a/package/base-files/Makefile b/package/base-files/Makefile
index 8a1ddf96f5..d8d093a306 100644
--- a/package/base-files/Makefile
+++ b/package/base-files/Makefile
@@ -30,7 +30,7 @@ PKG_CONFIG_DEPENDS += \
 include $(INCLUDE_DIR)/package.mk
 
 ifneq ($(DUMP),1)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | mkhash md5)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | $(MKHASH) md5)
   TARGET:=-$(BOARD)
 endif
 
diff --git a/package/kernel/linux/Makefile b/package/kernel/linux/Makefile
index 39b9e82c27..9fa68d78f7 100644
--- a/package/kernel/linux/Makefile
+++ b/package/kernel/linux/Makefile
@@ -24,7 +24,7 @@ export SHELL:=/bin/sh
 include $(INCLUDE_DIR)/package.mk
 
 ifeq ($(DUMP),)
-  STAMP_BUILT:=$(STAMP_BUILT)_$(shell $(SCRIPT_DIR)/kconfig.pl $(LINUX_DIR)/.config | mkhash md5)
+  STAMP_BUILT:=$(STAMP_BUILT)_$(shell $(SCRIPT_DIR)/kconfig.pl $(LINUX_DIR)/.config | $(MKHASH) md5)
   -include $(LINUX_DIR)/.config
 endif
 
diff --git a/package/libs/openssl/Makefile b/package/libs/openssl/Makefile
index 7ab4c6ccd0..11e5ecfccb 100644
--- a/package/libs/openssl/Makefile
+++ b/package/libs/openssl/Makefile
@@ -322,7 +322,7 @@ endif
 
 OPENSSL_TARGET:=linux-$(call qstrip,$(CONFIG_ARCH))-openwrt
 
-STAMP_CONFIGURED := $(STAMP_CONFIGURED)_$(shell echo $(OPENSSL_OPTIONS) | mkhash md5)
+STAMP_CONFIGURED := $(STAMP_CONFIGURED)_$(shell echo $(OPENSSL_OPTIONS) | $(MKHASH) md5)
 
 define Build/Configure
 	(cd $(PKG_BUILD_DIR); \
diff --git a/package/network/services/dropbear/Makefile b/package/network/services/dropbear/Makefile
index 8bbb26f829..77887f39db 100644
--- a/package/network/services/dropbear/Makefile
+++ b/package/network/services/dropbear/Makefile
@@ -37,7 +37,7 @@ PKG_CONFIG_DEPENDS:= \
 include $(INCLUDE_DIR)/package.mk
 
 ifneq ($(DUMP),1)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | mkhash md5)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | $(MKHASH) md5)
 endif
 
 define Package/dropbear/Default
diff --git a/package/network/utils/iptables/Makefile b/package/network/utils/iptables/Makefile
index b1ac0be4e8..42d9af14b0 100644
--- a/package/network/utils/iptables/Makefile
+++ b/package/network/utils/iptables/Makefile
@@ -28,7 +28,7 @@ include $(INCLUDE_DIR)/package.mk
 ifeq ($(DUMP),)
   -include $(LINUX_DIR)/.config
   include $(INCLUDE_DIR)/netfilter.mk
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep 'NETFILTER' $(LINUX_DIR)/.config | mkhash md5)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep 'NETFILTER' $(LINUX_DIR)/.config | $(MKHASH) md5)
 endif
 
 
diff --git a/package/system/procd/Makefile b/package/system/procd/Makefile
index 4c34bab6f1..2b0ea6d119 100644
--- a/package/system/procd/Makefile
+++ b/package/system/procd/Makefile
@@ -32,7 +32,7 @@ include $(INCLUDE_DIR)/package.mk
 include $(INCLUDE_DIR)/cmake.mk
 
 ifeq ($(DUMP),)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | mkhash md5)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell echo $(CONFIG_TARGET_INIT_PATH) | $(MKHASH) md5)
 endif
 
 CMAKE_OPTIONS += -DEARLY_PATH="$(TARGET_INIT_PATH)"
diff --git a/package/utils/busybox/Makefile b/package/utils/busybox/Makefile
index 475a154fa3..76a910361e 100644
--- a/package/utils/busybox/Makefile
+++ b/package/utils/busybox/Makefile
@@ -38,7 +38,7 @@ endif
 include $(INCLUDE_DIR)/package.mk
 
 ifeq ($(DUMP),)
-  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep '^CONFIG_BUSYBOX_' $(TOPDIR)/.config | mkhash md5)
+  STAMP_CONFIGURED:=$(strip $(STAMP_CONFIGURED))_$(shell grep '^CONFIG_BUSYBOX_' $(TOPDIR)/.config | $(MKHASH) md5)
 endif
 
 # All files provided by busybox will serve as fallback alternatives by opkg.
diff --git a/rules.mk b/rules.mk
index f31d9bb113..51f822e3f1 100644
--- a/rules.mk
+++ b/rules.mk
@@ -27,7 +27,7 @@ empty:=
 space:= $(empty) $(empty)
 comma:=,
 merge=$(subst $(space),,$(1))
-confvar=$(shell echo '$(foreach v,$(1),$(v)=$(subst ','\'',$($(v))))' | $(STAGING_DIR_HOST)/bin/mkhash md5)
+confvar=$(shell echo '$(foreach v,$(1),$(v)=$(subst ','\'',$($(v))))' | $(MKHASH) md5)
 strip_last=$(patsubst %.$(lastword $(subst .,$(space),$(1))),%,$(1))
 
 paren_left = (
@@ -266,6 +266,9 @@ TARGET_CXX:=$(TARGET_CROSS)g++
 KPATCH:=$(SCRIPT_DIR)/patch-kernel.sh
 SED:=$(STAGING_DIR_HOST)/bin/sed -i -e
 ESED:=$(STAGING_DIR_HOST)/bin/sed -E -i -e
+MKHASH:=$(STAGING_DIR_HOST)/bin/mkhash
+# MKHASH is used in /scripts, so we export it here.
+export MKHASH
 CP:=cp -fpR
 LN:=ln -sf
 XARGS:=xargs -r
@@ -399,7 +402,7 @@ endef
 # $(2) => If set, recurse into subdirectories
 define sha256sums
 	(cd $(1); find . $(if $(2),,-maxdepth 1) -type f -not -name 'sha256sums' -printf "%P\n" | sort | \
-		xargs -r $(STAGING_DIR_HOST)/bin/mkhash -n sha256 | sed -ne 's!^\(.*\) \(.*\)$$!\1 *\2!p' > sha256sums)
+		xargs -r $(MKHASH) -n sha256 | sed -ne 's!^\(.*\) \(.*\)$$!\1 *\2!p' > sha256sums)
 endef
 
 # file extension
diff --git a/scripts/combined-ext-image.sh b/scripts/combined-ext-image.sh
index 7ff287bde7..c20203f23b 100755
--- a/scripts/combined-ext-image.sh
+++ b/scripts/combined-ext-image.sh
@@ -63,7 +63,7 @@ while [ "$#" -gt 1 ]
 
       [ ! -f "$file" ] && echo "$ME: Not a valid file: $file" && usage
       FILES="$FILES $file"
-      md5=$(mkhash md5 "$file")
+      md5=$($MKHASH md5 "$file")
       printf "%-32s%08x%32s" "$filename" $(stat -c "%s" "$file") "${md5%% *}" >> "${IMG_TMP_OUT}"
       shift 2
    done
diff --git a/scripts/combined-image.sh b/scripts/combined-image.sh
index 4e00cb89a2..a365fbc536 100755
--- a/scripts/combined-image.sh
+++ b/scripts/combined-image.sh
@@ -16,7 +16,7 @@ dd if="$1" of="$kern" bs=$BLKSZ conv=sync 2>/dev/null
 dd if="$2" of="$root" bs=$BLKSZ conv=sync 2>/dev/null
 
 # Calculate md5sum over combined kernel and rootfs image.
-md5=$(cat "$kern" "$root" | mkhash md5)
+md5=$(cat "$kern" "$root" | $MKHASH md5)
 
 # Write image header followed by kernel and rootfs image.
 # The header is padded to 64k, format is:
diff --git a/scripts/download.pl b/scripts/download.pl
index a1d80e9b42..8e6463c007 100755
--- a/scripts/download.pl
+++ b/scripts/download.pl
@@ -65,8 +65,8 @@ sub hash_cmd() {
 	my $len = length($file_hash);
 	my $cmd;
 
-	$len == 64 and return "mkhash sha256";
-	$len == 32 and return "mkhash md5";
+	$len == 64 and return "$ENV{'MKHASH'} sha256";
+	$len == 32 and return "$ENV{'MKHASH'} md5";
 	return undef;
 }
 
@@ -296,4 +296,3 @@ while (!-f "$target/$filename") {
 }
 
 $SIG{INT} = \&cleanup;
-
diff --git a/scripts/ipkg-make-index.sh b/scripts/ipkg-make-index.sh
index f6f15d7dd8..8965d0aa18 100755
--- a/scripts/ipkg-make-index.sh
+++ b/scripts/ipkg-make-index.sh
@@ -18,7 +18,7 @@ for pkg in `find $pkg_dir -name '*.ipk' | sort`; do
 	[[ "$name" = "libc" ]] && continue
 	echo "Generating index for package $pkg" >&2
 	file_size=$(stat -L -c%s $pkg)
-	sha256sum=$(mkhash sha256 $pkg)
+	sha256sum=$($MKHASH sha256 $pkg)
 	# Take pains to make variable value sed-safe
 	sed_safe_pkg=`echo $pkg | sed -e 's/^\.\///g' -e 's/\\//\\\\\\//g'`
 	tar -xzOf $pkg ./control.tar.gz | tar xzOf - ./control | sed -e "s/^Description:/Filename: $sed_safe_pkg\\
diff --git a/scripts/om-fwupgradecfg-gen.sh b/scripts/om-fwupgradecfg-gen.sh
index bf7c047c5b..c3858416a6 100755
--- a/scripts/om-fwupgradecfg-gen.sh
+++ b/scripts/om-fwupgradecfg-gen.sh
@@ -54,8 +54,8 @@ esac
 CHECK_BS=65536
 
 KERNEL_SIZE=$(stat -c%s "$KERNEL_PATH")
-KERNEL_MD5=$(mkhash md5 $KERNEL_PATH)
-KERNEL_SHA256=$(mkhash sha256 $KERNEL_PATH)
+KERNEL_MD5=$($MKHASH md5 $KERNEL_PATH)
+KERNEL_SHA256=$($MKHASH sha256 $KERNEL_PATH)
 KERNEL_PART_SIZE_KB=$((KERNEL_SIZE / 1024))
 KERNEL_PART_SIZE=$(printf $SIZE_FORMAT $(($KERNEL_PART_SIZE_KB * $SIZE_FACTOR)))
 
@@ -63,9 +63,9 @@ ROOTFS_FLASH_ADDR=$(addr=$(($KERNEL_FLASH_ADDR + ($KERNEL_PART_SIZE_KB * 1024)))
 ROOTFS_SIZE=$(stat -c%s "$ROOTFS_PATH")
 ROOTFS_SQUASHFS_SIZE=$((ROOTFS_SIZE-4))
 ROOTFS_CHECK_BLOCKS=$((ROOTFS_SQUASHFS_SIZE / CHECK_BS))
-ROOTFS_MD5=$(dd if=$ROOTFS_PATH bs=$CHECK_BS count=$ROOTFS_CHECK_BLOCKS 2>&- | mkhash md5)
-ROOTFS_MD5_FULL=$(mkhash md5 $ROOTFS_PATH)
-ROOTFS_SHA256_FULL=$(mkhash sha256 $ROOTFS_PATH)
+ROOTFS_MD5=$(dd if=$ROOTFS_PATH bs=$CHECK_BS count=$ROOTFS_CHECK_BLOCKS 2>&- | $MKHASH md5)
+ROOTFS_MD5_FULL=$($MKHASH md5 $ROOTFS_PATH)
+ROOTFS_SHA256_FULL=$($MKHASH sha256 $ROOTFS_PATH)
 ROOTFS_CHECK_SIZE=$(printf '0x%x' $ROOTFS_SQUASHFS_SIZE)
 ROOTFS_PART_SIZE_KB=$(($MAX_PART_SIZE - $KERNEL_PART_SIZE_KB))
 ROOTFS_PART_SIZE=$(printf $SIZE_FORMAT $(($ROOTFS_PART_SIZE_KB * $SIZE_FACTOR)))
diff --git a/target/linux/ath79/image/generic.mk b/target/linux/ath79/image/generic.mk
index 303907e5bb..222a1511a7 100644
--- a/target/linux/ath79/image/generic.mk
+++ b/target/linux/ath79/image/generic.mk
@@ -35,7 +35,7 @@ define Build/addpattern
 endef
 
 define Build/append-md5sum-bin
-	$(STAGING_DIR_HOST)/bin/mkhash md5 $@ | sed 's/../\\\\x&/g' |\
+	$(MKHASH) md5 $@ | sed 's/../\\\\x&/g' |\
 		xargs echo -ne >> $@
 endef
 
diff --git a/target/linux/ramips/image/Makefile b/target/linux/ramips/image/Makefile
index 5937970a37..fc5223f3a4 100644
--- a/target/linux/ramips/image/Makefile
+++ b/target/linux/ramips/image/Makefile
@@ -91,7 +91,7 @@ endef
 
 define Build/netis-tail
 	echo -n $(1) >> $@
-	echo -n $(UIMAGE_NAME)-yun | $(STAGING_DIR_HOST)/bin/mkhash md5 | \
+	echo -n $(UIMAGE_NAME)-yun | $(MKHASH) md5 | \
 		sed 's/../\\\\x&/g' | xargs echo -ne >> $@
 endef
 
diff --git a/target/linux/ramips/image/mt7620.mk b/target/linux/ramips/image/mt7620.mk
index 64dc0715ed..3caeecebee 100644
--- a/target/linux/ramips/image/mt7620.mk
+++ b/target/linux/ramips/image/mt7620.mk
@@ -9,9 +9,9 @@ DEVICE_VARS += DLINK_ROM_ID DLINK_FAMILY_MEMBER DLINK_FIRMWARE_SIZE DLINK_IMAGE_
 define Build/elecom-header
 	cp $@ $(KDIR)/v_0.0.0.bin
 	( \
-		mkhash md5 $(KDIR)/v_0.0.0.bin && \
+		$(MKHASH) md5 $(KDIR)/v_0.0.0.bin && \
 		echo 458 \
-	) | mkhash md5 > $(KDIR)/v_0.0.0.md5
+	) | $(MKHASH) md5 > $(KDIR)/v_0.0.0.md5
 	$(STAGING_DIR_HOST)/bin/tar -c \
 		$(if $(SOURCE_DATE_EPOCH),--mtime=@$(SOURCE_DATE_EPOCH)) \
 		--owner=0 --group=0 -f $@ -C $(KDIR) v_0.0.0.bin v_0.0.0.md5
diff --git a/target/linux/ramips/image/mt7621.mk b/target/linux/ramips/image/mt7621.mk
index 2c7aa80505..48448c2ab1 100644
--- a/target/linux/ramips/image/mt7621.mk
+++ b/target/linux/ramips/image/mt7621.mk
@@ -13,7 +13,7 @@ define Build/elecom-wrc-gs-factory
 	$(eval product=$(word 1,$(1)))
 	$(eval version=$(word 2,$(1)))
 	$(eval hash_opt=$(word 3,$(1)))
-	$(STAGING_DIR_HOST)/bin/mkhash md5 $(hash_opt) $@ >> $@
+	$(MKHASH) md5 $(hash_opt) $@ >> $@
 	( \
 		echo -n "ELECOM $(product) v$(version)" | \
 			dd bs=32 count=1 conv=sync; \
@@ -61,13 +61,13 @@ define Build/ubnt-erx-factory-image
 		$(TAR) -cf $(1) --transform='s/^.*/compat/' $(1).compat; \
 		\
 		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp/' $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE); \
-		mkhash md5 $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) > $(1).md5; \
+		$(MKHASH) md5 $(KDIR)/tmp/$(KERNEL_INITRAMFS_IMAGE) > $(1).md5; \
 		$(TAR) -rf $(1) --transform='s/^.*/vmlinux.tmp.md5/' $(1).md5; \
 		\
 		echo "dummy" > $(1).rootfs; \
 		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp/' $(1).rootfs; \
 		\
-		mkhash md5 $(1).rootfs > $(1).md5; \
+		$(MKHASH) md5 $(1).rootfs > $(1).md5; \
 		$(TAR) -rf $(1) --transform='s/^.*/squashfs.tmp.md5/' $(1).md5; \
 		\
 		echo '$(BOARD) $(VERSION_CODE) $(VERSION_NUMBER)' > $(1).version; \