Could NOT find LibXml2 (missing: LIBXML2_LIBRARY LIBXML2_INCLUDE_DIR)Call Stack

　　系统有libxml2，报错应该是没有定义。

• 安装依赖库

apt install libxml2-dev

• 定义环境变量

export LIBXML2_LIBRARY=/usr/lib/x86_64-linux-gnu
export LIBXML2_INCLUDE_DIR=/usr/include

• 再次编译