https://blog.csdn.net/ximerr/article/details/87111624

https://git.ntut.com.tw/others/openconnect

下载编译 openconnect ，命令依次为：

git clone https://github.com/dlenski/openconnect.git

Building from source on Linux

Under Debian-based or Ubuntu-based distributions, this should install the requirements:

$ sudo apt-get install \
    build-essential gettext autoconf automake libproxy-dev \
    libxml2-dev libtool vpnc-scripts pkg-config zlib1g-dev \
    libgnutls-dev # may be named libgnutls28-dev on some recent Debian/Ubuntu-based distros

Once you have all the build dependencies installed, checkout and build from this repository.

$ git clone https://github.com/dlenski/openconnect.git
$ cd openconnect
$ ./autogen.sh
$ ./configure
$ make
$ sudo make install && sudo ldconfig