add custom Packages into OpenWrt image

用SDK编译好所需软件包(.ipk)
修改imagebuilder中repositories.conf
添加一行到软件包目录的src如
src custom file:///home/zs/packages

创建包列表
cd /home/zs/packages
./<imagebuilderdir>/scripts/ipkg-make-index.sh ./ > Packages
gzip -9c ./Packages > ./Packages.gz

若遇上无法找到mkhash错误
可将
sha256sum=$(mkhash sha256sum $pkg)
改为
sha256sum=$(sha256sum $pkg|awk ‘{print $1}’)

然后在make image的PACKAGES 参数可使用自编译的包