ubuntu 安装 rasa-x

pip3 install rasa-x --extra-index-url https://pypi.rasa.com/simple

报错：

Failed to build xmlsec
ERROR: Could not build wheels for xmlsec, which is required to install pyproject.toml-based projects

解决办法：

Note: There is no required version of LibXML2 for Ubuntu Precise, so you need to download and install it manually.

wget http://xmlsoft.org/sources/libxml2-2.9.1.tar.gz
tar -xvf libxml2-2.9.1.tar.gz
cd libxml2-2.9.1
./configure && make && make install