root:

mkdir /opt/srs
chown <user>:users /opt/srs

user:

apt install python3-setuptools libssl-dev
git clone https://github.com/ossrs/srs.git \
&& cd srs/trunk \
&& ./configure --use-sys-ssl --prefix=/opt/srs/ \
&& make \
&& make install

The build summary:
     +------------------------------------------------------------------------------------
     For SRS benchmark, gperf, gprof and valgrind, please read:
          http://blog.csdn.net/win_lin/article/details/53503869
     +------------------------------------------------------------------------------------
     |The main server usage: ./objs/srs -c conf/srs.conf, start the srs server
     |     About HLS, please read https://github.com/ossrs/srs/wiki/v2_CN_DeliveryHLS
     |     About DVR, please read https://github.com/ossrs/srs/wiki/v3_CN_DVR
     |     About SSL, please read https://github.com/ossrs/srs/wiki/v1_CN_RTMPHandshake
     |     About transcoding, please read https://github.com/ossrs/srs/wiki/v3_CN_FFMPEG
     |     About ingester, please read https://github.com/ossrs/srs/wiki/v1_CN_Ingest
     |     About http-callback, please read https://github.com/ossrs/srs/wiki/v3_CN_HTTPCallback
     |     Aoubt http-server, please read https://github.com/ossrs/srs/wiki/v2_CN_HTTPServer
     |     About http-api, please read https://github.com/ossrs/srs/wiki/v3_CN_HTTPApi
     |     About stream-caster, please read https://github.com/ossrs/srs/wiki/v2_CN_Streamer
     |     (Disabled) About VALGRIND, please read https://github.com/ossrs/state-threads/issues/2
     +------------------------------------------------------------------------------------
binaries, please read https://github.com/ossrs/srs/wiki/v2_CN_Build
You can:
      ./objs/srs -c conf/srs.conf
                  to start the srs server, with config conf/srs.conf.