+
+# in case that an customer source path is provided, set the acc. default variable
+ifeq ($(CONFIG_$(PKG_NAME)_USE_CUSTOM_SOURCE_DIR),y)
+PKG_DEFAULT_CUSTOM_SOURCE_DIR:= $(strip $(subst ",, $(CONFIG_$(PKG_NAME)_CUSTOM_SOURCE_DIR)))
+endif
+
+# package specific configuration
+# if includeded the package source path can be overwritten within the .config file (instead of changing the package specific Makefile)
+# instead of using a source ball (eg tar.gz) the specified path will point to the location of the sources
+define Package/$(PKG_NAME)/override_source_path
+ menu "custom source directory"
+ depends on PACKAGE_$(PKG_NAME)
+ config $(PKG_NAME)_USE_CUSTOM_SOURCE_DIR
+ depends on PACKAGE_$(PKG_NAME)
+ bool "Use custom source directory"
+ default n
+ config $(PKG_NAME)_CUSTOM_SOURCE_DIR
+ depends on $(PKG_NAME)_USE_CUSTOM_SOURCE_DIR
+ string "Custom source directory"
+ default "$(PKG_DEFAULT_CUSTOM_SOURCE_DIR)"
+ endmenu
+endef
+
+# default:
+# include both configurations as long this file is included before package.mk
+# in case that you're defining your own onfiguration within the package Makefile just include the stuff by yourself
+define Package/$(PKG_NAME)/config
+ $(call Package/$(PKG_NAME)/override_version)
+ $(call Package/$(PKG_NAME)/override_source_path)
+endef
+
+# hook for custom source path
+# in case that the specified path is valid a link to the PKG_SOURCE_DIR is created
+# otherwise the make is stopped
+define prepare_custom_source_directory
+ if [ -d $(CONFIG_$(PKG_NAME)_CUSTOM_SOURCE_DIR) ]; then \
+ rm -Rf $(PKG_BUILD_DIR); \
+ echo "Preparing Custom Source Directory link: $(CONFIG_$(PKG_NAME)_CUSTOM_SOURCE_DIR)"; \
+ ln -snf $(CONFIG_$(PKG_NAME)_CUSTOM_SOURCE_DIR) $(PKG_BUILD_DIR); \
+ ( cd $(PKG_BUILD_DIR); autoreconf -i; ) \
+ else \
+ echo "Custom Source Directory $(CONFIG_$(PKG_NAME)_CUSTOM_SOURCE_DIR) is invalid"; \
+ false; \
+ fi
+endef
+