janus gateway: configure shows websockets not enabled

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I am trying to use janus. First step, installation. I followed the instructions here. All is well. However, when I run

    configure prefix=/opt/janus

Relevant portions of the output are:

...
checking for TRANSPORTS... yes
checking for MHD... yes
checking for lws_create_vhost in -lwebsockets... no
checking for amqp_error_string2 in -lrabbitmq... no
checking for MQTTAsync_create in -lpaho-mqtt3a... no
checking for PLUGINS... yes
checking for SOFIA... yes
checking for OPUS... yes
checking for OGG... yes
checking for EVENTS... yes
checking that generated files are newer than configure... done
configure: creating ./config.status
config.status: creating Makefile
config.status: creating html/Makefile
config.status: creating docs/Makefile
config.status: executing depfiles commands
config.status: executing libtool commands

libsrtp version:           1.5.x
SSL/crypto library:        OpenSSL
DTLS set-timeout:          not available
DataChannels support:      no
Recordings post-processor: no
TURN REST API client:      yes
Doxygen documentation:     no
Transports:
    REST (HTTP/HTTPS):     yes
    WebSockets:            no
    RabbitMQ:              no
    MQTT:                  no
    Unix Sockets:          yes
Plugins:
    Echo Test:             yes
    Streaming:             yes
    Video Call:            yes
    SIP Gateway:           yes
    Audio Bridge:          yes
    Video Room:            yes
    Voice Mail:            yes
    Record&Play:           yes
    Text Room:             yes

MY PROBLEM IS WITH THE ENTRY WebSockets: no.

I checked in /usr/lib and here are the relevant files there:

 /usr/lib/libwebsockets.a  /usr/lib/libwebsockets.so  
 /usr/lib/libwebsockets.so.11  /usr/lib/libwebsockets.so.5

And in /usr/include

 /usr/include/libwebsockets.h

So, I think that libwebsockets is installed properly. What needs to be done to get the webSockets transport enabled?

I did look at this too.

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tgabi333 On BEST ANSWER

Since https://github.com/meetecho/janus-gateway/pull/996

You need libwebsockets >= 2.0.0. Trusty has an old version.

You have to compile it. See the description of janus how to do that.