关于Click参考主页：
OpenWrt的安装包中也有Click但是版本很旧已经被标注BROKEN，所以在menuconfig里面是不可见的，现在介绍一下我安装最新版的步骤。
1.下载代码，我下载的版本是Release 1.8.0,地址：
2.删除feeds/pacages/net/click文件夹中所有内容，新建src文件夹，将click代码解压到src中
3.新建Makefile文件，写入（由旧有click安装包里的Makefile修改而来）
include $(TOPDIR)/rules.mk
PKG_NAME:=click
PKG_RELEASE:=1.8.0
include $(INCLUDE_DIR)/package.mk
define Package/click
SECTION:=net
CATEGORY:=Network
MENU:=1
TITLE:=The Click Modular Router
URL:=http://www.read.cs.ucla.edu/click/
endef
define Package/click/description
The Click Modular Router
endef
BUILDOPTS = \
BUILD_CXX="g++ -I $(PKG_BUILD_DIR)/include-host" \
BUILD_DL_LIBS="-ldl"
define Build/Prepare
mkdir -p $(PKG_BUILD_DIR)
$(CP) ./src/* $(PKG_BUILD_DIR)/
endef
define Build/Configure
(cd $(PKG_BUILD_DIR); \
rm -rf config.{cache,status} ; \
CONFIG_SITE= \
./configure; \
rm -rf include-host; \
$(CP) include include-host; \
rm -rf config.{cache,status} ; \
$(TARGET_CONFIGURE_OPTS) \
CXXFLAGS="-static -Os -MD" \
CFLAGS="-static -MD" \
CPPFLAGS="-I$(STAGING_DIR)/usr/include" \
LDFLAGS="-L$(STAGING_DIR)/usr/lib" \
$(BUILDOPTS) \
./configure \
--prefix=/usr \
--target=$(GNU_TARGET_NAME) \
--host=$(GNU_TARGET_NAME) \
--build=$(GNU_HOST_NAME) \
--enable-wifi \
--disable-linuxmodule \
--enable-tools=mixed \
--disable-dynamic-linking \
)
endef
define Build/Compile
rm -rf $(PKG_INSTALL_DIR)
mkdir -p $(PKG_INSTALL_DIR)
$(CONF_OPTS) \
$(MAKE) -C $(PKG_BUILD_DIR) \
$(BUILDOPTS) \
install
endef
define Package/click/install
$(INSTALL_DIR) $(1)/usr/bin
$(INSTALL_BIN) $(PKG_BUILD_DIR)/userlevel/click $(1)/usr/bin/click
$(INSTALL_BIN) $(PKG_BUILD_DIR)/tools/click-align/click-align $(1)/usr/bin/click-align
mkdir -p $(1)/usr/share/click
$(CP) $(PKG_BUILD_DIR)/elementmap.xml $(1)/usr/share/click
endef
$(eval $(call BuildPackage,click))
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4.编译click（root权限），在生成的ipk包中包含click主程序，click-align用于生字节成对齐的代码，
elementmap.xml组件信息
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