MT7688如何更新menuconfig中的内容（openwrt）

许多开发者在开发MT7688的时候，使用make menuconfig后发现没有自己需要的lib库或者模块，那么可能是你的feeds太旧了，需要更新
更新方法：

./scripts/feeds update -a

然后

./scripts/feeds install -a

如果你更新之后还是没有，需要修改某个文件
该文件在openwrt文件夹下，即feeds.conf.default
比如默认为

src-git packages https://github.com/openwrt/packages.git;for-15.05
src-git luci https://github.com/openwrt/luci.git;for-15.05
src-git routing https://github.com/openwrt-routing/packages.git;for-15.05
src-git telephony https://github.com/openwrt/telephony.git;for-15.05
src-git management https://github.com/openwrt-management/packages.git;for-15.05
#src-git targets https://github.com/openwrt/targets.git
#src-git oldpackages http://git.openwrt.org/packages.git
#src-svn xwrt http://x-wrt.googlecode.com/svn/trunk/package
#src-svn phone svn://svn.openwrt.org/openwrt/feeds/phone
#src-svn efl svn://svn.openwrt.org/openwrt/feeds/efl
#src-svn xorg svn://svn.openwrt.org/openwrt/feeds/xorg
#src-svn desktop svn://svn.openwrt.org/openwrt/feeds/desktop
#src-svn xfce svn://svn.openwrt.org/openwrt/feeds/xfce
#src-svn lxde svn://svn.openwrt.org/openwrt/feeds/lxde
#src-link custom /usr/src/openwrt/custom-feed

则需要改为

src-git packages https://github.com/openwrt/packages.git
src-git luci https://github.com/openwrt/luci.git
src-git routing https://github.com/openwrt-routing/packages.git
src-git telephony https://github.com/openwrt/telephony.git
src-git management https://github.com/openwrt-management/packages.git
#src-git targets https://github.com/openwrt/targets.git
#src-git oldpackages http://git.openwrt.org/packages.git
#src-svn xwrt http://x-wrt.googlecode.com/svn/trunk/package
#src-svn phone svn://svn.openwrt.org/openwrt/feeds/phone
#src-svn efl svn://svn.openwrt.org/openwrt/feeds/efl
#src-svn xorg svn://svn.openwrt.org/openwrt/feeds/xorg
#src-svn desktop svn://svn.openwrt.org/openwrt/feeds/desktop
#src-svn xfce svn://svn.openwrt.org/openwrt/feeds/xfce
#src-svn lxde svn://svn.openwrt.org/openwrt/feeds/lxde
#src-link custom /usr/src/openwrt/custom-feed

则会更新到最新的feeds配置

最后，再次make menuconfig就能找到新添加的选项