Debian 7 安装 libudns-dev

只有jessie/Debian8才开始有这个包, Debian7想要安装的得添加jessie源

deb http://http.us.debian.org/debian jessie main

echo "deb http://http.us.debian.org/debian jessie main" >> /etc/apt/sources.list

apt-get  update

apt-get install  libudns-dev