编译
git clone https://github.com/meetecho/janus-gateway.git
sh autogen.sh
./configure --prefix=/opt/janus --enable-websockets --enable-docs –disable-plugin-lua

make
sudo make install
make configs//将所有的样例配置模板安装到/opt/janus/etc/janus文件夹下

janus.cfg  janus 的全局配置文件，但不包括其他插件的配置文件

例如 janus跟Android APP Demo通信，需要使用WeSocket插件，所以需要安装libwebsocket插件，然后进行相关的配置

janus 默认的配置中是没有 WebSocket 的配置的，直接启动 Janus 会因没有 WebSocket 配置文件而报错。幸运的是在配置目录中 Janus 已经给我们提供了一个 WebSocket 的示例配置文件 ： janus.transport.websockets.cfg.sample，（如果我们要通过 WebSocket 连接 Janus，则需要有个 WebSocket 的配置文件）这里我们可以直接拷贝这个示例文件：

cp janus.transport.websockets.cfg.sample janus.transport.websockets.cfg

./configure --prefix=/opt/janus --enable-websockets

配置完成之后，打印信息

Compiler:                  gcc
libsrtp version:           2.x
SSL/crypto library:        OpenSSL
DTLS set-timeout:          not available
Mutex implementation:      GMutex (native futex on Linux)
DataChannels support:      no
Recordings post-processor: no
TURN REST API client:      yes
Doxygen documentation:     no
Transports:
    REST (HTTP/HTTPS):     yes
    WebSockets:            yes
    RabbitMQ:              no
    MQTT:                  no
    Unix Sockets:          yes
    Nanomsg:               no
Plugins:
    Echo Test:             yes
    Streaming:             yes
    Video Call:            yes
    SIP Gateway (Sofia):   yes
    SIP Gateway (libre):   no
    NoSIP (RTP Bridge):    yes
    Audio Bridge:          yes
    Video Room:            yes
    Voice Mail:            yes
    Record&Play:           yes
    Text Room:             yes
    Lua Interpreter:       no
    Duktape Interpreter:   no
Event handlers:
    Sample event handler:  yes
    WebSocket ev. handler: yes
    RabbitMQ event handler:no
    MQTT event handler:    no
    Nanomsg event handler: no
External loggers:
    JSON file logger:      no
JavaScript modules:        no

If this configuration is ok for you, do a 'make' to start building Janus. A 'make install' will install Janus and its plugins to the specified prefix. Finally, a 'make configs' will install some sample configuration files too (something you'll only want to do the first time, though).

注意--enable-docs加载不成功，因此去掉该配置项

checking for doxygen... doxygen
checking for dot... no
configure: error: doxygen or dot not found. See README.md for installation instructions or remove --enable-docs