How to add a bash script package

I have been trying to add the run-one package to openwrt... Due to time constraints for now i created a files directory, but I 'd like to just normal download it...

Makefile

include $(TOPDIR)/rules.mk

PKG_NAME:=run-one
PKG_VERSION:=1.17
PKG_RELEASE:=1

PKG_SOURCE:=$(PKG_NAME)_$(PKG_VERSION).orig.tar.gz
PKG_SOURCE_URL:=https://launchpad.net/ubuntu/+archive/primary/+sourcefiles/run-one/$(PKG_VERSION)-0ubuntu2
PKG_HASH:=b7c9b257b52f29ba0d923a4dfee4edd47332ebeca0200c65f309eb6ae33f701f
# PKG_BUILD_DIR:=$(BUILD_DIR)/$(PKG_NAME)-$(PKG_VERSION)


PKG_MAINTAINER:=Maurice Smulders <MSmulders@xxx.xxx>
PKG_LICENSE:=GPLv3
PKG_LICENSE_FILES:=COPYING

include $(INCLUDE_DIR)/package.mk


define Package/run-one
  SECTION:=utils
  CATEGORY:=Utilities
  TITLE:=run-one
  URL:=https://git.launchpad.net/ubuntu/+source/run-one
  PKGARCH:=all
endef

define Package/run-one/description
   This utility will run just one instance at a time of some command and
   unique set of arguments (useful for cronjobs, eg).
endef

define Build/Configure
endef

define Build/Compile
endef

define Package/run-one/install
	$(INSTALL_DIR) $(1)/usr/bin
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/run-one $(1)/usr/bin/run-one
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/run-one-constantly $(1)/usr/bin/run-once-constantly
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/run-one-until-failure $(1)/usr/bin/run-one-until-failure
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/run-one-until-success $(1)/usr/bin/run-one-until-success
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/run-this-one $(1)/usr/bin/run-this-one
	$(INSTALL_BIN) $(PKG_BUILD_DIR)/keep-one-running $(1)/usr/bin/keep-one-running
endef

$(eval $(call BuildPackage,run-one))

I have not been able to build this target correctly. I am missing something but not sure what...

You use $(PKG_BUILD_DIR) but don't define it or put anything there,

in Build/prepare i copy the relevant script into the build dir ( usually form my src as this app was not fetched form a remote repo )

define Build/Prepare
#copy src to the build directory
 mkdir -p $(PKG_BUILD_DIR)/
 $(CP) ./src/* $(PKG_BUILD_DIR)/
endef

not sure if that helps