diff --git a/target/imagebuilder/Makefile b/target/imagebuilder/Makefile
index 42fb7bb69..9e9afb2b2 100644
--- a/target/imagebuilder/Makefile
+++ b/target/imagebuilder/Makefile
@@ -22,15 +22,18 @@ all: compile
 
 $(BIN_DIR)/$(IB_NAME).tar.bz2: clean
 	rm -rf $(PKG_BUILD_DIR)
-	mkdir -p $(IB_KDIR) $(PKG_BUILD_DIR)/staging_dir/host $(PKG_BUILD_DIR)/target
+	mkdir -p $(IB_KDIR) $(PKG_BUILD_DIR)/staging_dir/host \
+		$(PKG_BUILD_DIR)/target $(PKG_BUILD_DIR)/scripts
 	-cp $(TOPDIR)/.config $(PKG_BUILD_DIR)/.config
 	$(CP) \
 		$(INCLUDE_DIR) $(SCRIPT_DIR) \
 		$(TOPDIR)/rules.mk \
 		./files/Makefile \
+		./files/repositories.conf \
 		$(TMP_DIR)/.targetinfo \
 		$(TMP_DIR)/.packageinfo \
 		$(PKG_BUILD_DIR)/
+	$(CP) ./files/opkg-generate-config.sh $(PKG_BUILD_DIR)/scripts/
 	$(CP) $(PACKAGE_DIR) $(PKG_BUILD_DIR)/packages
 	$(CP) $(STAGING_DIR_HOST)/bin $(PKG_BUILD_DIR)/staging_dir/host/
 	$(CP) $(TOPDIR)/target/linux $(PKG_BUILD_DIR)/target/
diff --git a/target/imagebuilder/files/Makefile b/target/imagebuilder/files/Makefile
index 8e6c6d746..0590dfa72 100644
--- a/target/imagebuilder/files/Makefile
+++ b/target/imagebuilder/files/Makefile
@@ -86,19 +86,12 @@ _call_info: FORCE
 $(TOPDIR)/tmp/opkg.conf: FORCE
 	@mkdir -p $(TOPDIR)/tmp
 	@mkdir -p $(TARGET_DIR)/tmp
-	@echo 'dest root /' > $@
-	@echo 'src packages file:$(PACKAGE_DIR)' >> $@
-	@echo 'arch all 100' >> $@
-ifneq ($(CONFIG_TARGET_adm5120),y)
-	@echo 'arch $(BOARD) 200' >> $@
-else
-	@echo 'arch $(BOARD)_$(ARCH) 200' >> $@
-endif
-	@echo 'option offline_root $(TARGET_DIR)' >> $@
+	@$(TOPDIR)/scripts/opkg-generate-config.sh $(TARGET_DIR)
 
 BUILD_PACKAGES:=$(sort $(DEFAULT_PACKAGES) $(USER_PACKAGES) $($(USER_PROFILE)_PACKAGES) kernel)
 # "-pkgname" in the package list means remove "pkgname" from the package list
 BUILD_PACKAGES:=$(filter-out $(filter -%,$(BUILD_PACKAGES)) $(patsubst -%,%,$(filter -%,$(BUILD_PACKAGES))),$(BUILD_PACKAGES))
+PACKAGES:=
 
 _call_image:
 	echo 'Building images for $(BOARD)$(if $($(USER_PROFILE)_NAME), - $($(USER_PROFILE)_NAME))'
diff --git a/target/imagebuilder/files/opkg-generate-config.sh b/target/imagebuilder/files/opkg-generate-config.sh
new file mode 100755
index 000000000..a385d9fa9
--- /dev/null
+++ b/target/imagebuilder/files/opkg-generate-config.sh
@@ -0,0 +1,45 @@
+#!/bin/sh
+
+TOPDIR="$(pwd)"
+TARGETDIR="${1}"
+
+[ -f "$TOPDIR/scripts/${0##*/}" ] || {
+	echo "Please execute within the toplevel directory" >&2
+	exit 1
+}
+
+# Try to find package architecture from packages directory
+PKGARCH=
+for pkg in $TOPDIR/packages/*.ipk; do
+	if [ -f "$pkg" ]; then
+		PKGARCH="${pkg##*_}"
+		PKGARCH="${PKGARCH%.ipk}"
+		[ "$PKGARCH" = all ] || break
+	fi
+done
+
+# Try to find package architecture from the target directory
+[ -n "$PKGARCH" ] || {
+	PKGARCH="${TARGETDIR##*/root-}"
+	[ "$PKGARCH" != "$TARGETDIR" ] || {
+		echo "Cannot determine package architecture" >&2
+		exit 1
+	}
+}
+
+rm -f $TOPDIR/tmp/opkg.conf
+
+[ -f $TOPDIR/repositories.conf ] && \
+	$TOPDIR/staging_dir/host/bin/sed \
+		-n -e "s/\$A/$PKGARCH/g" -e "/^[[:space:]*]src/p" \
+		$TOPDIR/repositories.conf > $TOPDIR/tmp/opkg.conf
+
+cat <<EOT >> $TOPDIR/tmp/opkg.conf
+dest root /
+arch all 100
+arch $PKGARCH 200
+option offline_root $TARGETDIR
+src imagebuilder file:$TOPDIR/packages
+EOT
+
+exit 0
diff --git a/target/imagebuilder/files/repositories.conf b/target/imagebuilder/files/repositories.conf
new file mode 100644
index 000000000..a8bb18345
--- /dev/null
+++ b/target/imagebuilder/files/repositories.conf
@@ -0,0 +1,5 @@
+## Place your custom repositories here, they must match the architecture and version.
+## The special placeholder "$A" can be used to specify the current package architecture.
+
+# src/gz snapshots http://downloads.openwrt.org/snapshots/trunk/$A/packages
+# src custom file:///usr/src/openwrt/bin/$A/packages