just use opam

<code>
opam init
<y>
eval `opam config env`

opam update
opam upgrade
opam install liquidsoap cry faad fdkaac flac ladspa lame mad magic ogg opus samplerate ssl taglib vorbis
ln -s $HOME/.opam/system/liquidsoap /usr/local/bin/liquidsoap

Sections below show how to build and install from source.

• the repository ppa:avsm/ppa is not to be used at 16.04 or higher

sudo apt-get install opam
opam init
<y>
eval `opam config env`

opam update
opam upgrade

sudo opam install pcre
sudo opam install camomile
sudo opam install xmlm

sudo apt-get -y install libgstreamer1.0-0 libgstreamer1.0-dev
sudo apt-get -y install libgstreamer-ocaml libgstreamer-ocaml-dev libgstreamer-plugins-base1.0-dev
sudo apt-get -y install libtaglib2.1-cil libtaglib-cil-dev libtaglib-ocaml libtaglib-ocaml-dev
sudo apt-get -y install libaacs0 libaacs-dev
sudo apt-get -y install libaac-tactics-ocaml-dev
sudo apt-get -y install libflac-ocaml-dev
sudo apt-get -y install libavformat-dev libavformat-ffmpeg56
sudo apt-get -y install libavutil-dev libavutil-ffmpeg54
sudo apt-get -y install libswscale-ffmpeg3 libswscale-dev
sudo apt-get -y install libfrei0r-ocaml-dev
sudo apt-get -y install liblo liblo-dev
sudo apt-get -y install libsoundtouch1 libsoundtouch-dev

sudo apt-get install libflac++6v5:i386 libflac++6v5 libtag1-vanilla libtag1v5-vanilla:i386 libtag1v5:i386 libtag1v5-vanilla libtag1v5

mkdir ~/liquidsoap
./configure --enable-debugging --disable-graphics --prefix=~/liquidsoap --exec-prefix=~/liquidsoap

Starting with liquidsoap 1.2. a fresh ocaml is needed due to dependency to the ocaml bytes module which is not included in LTS 14.04. see: http://freedrool.us/blog/latest-liquidsoap-full-compile/

For LTS 14.04 (only) you will need to use opam from PPA .

sudo add-apt-repository ppa:avsm/ppa
sudo apt-get update
sudo apt-get install ocaml ocaml-native-compilers camlp4-extra opam

sudo opam init
<y>
eval `opam config env`

sudo opam install pcre
sudo opam install camomile
sudo opam install xmlm

Next steps are same as for LTS 12.04

sudo apt-get -y install autoconf
sudo apt-get -y install libtool
sudo apt-get -y install g++
sudo apt-get -y install libxml-dom-perl
sudo apt-get -y install festival
sudo apt-get -y install git
sudo apt-get -y install swh-plugins

sudo apt-get -y install libmagic-ocaml-dev
sudo apt-get -y install libcamomile-ocaml-dev
sudo apt-get -y install libxml-light-ocaml-dev
sudo apt-get -y install ocaml-compiler-libs
sudo apt-get -y install libfindlib-ocaml
sudo apt-get -y install libfindlib-ocaml-dev
sudo apt-get -y install libpulse-ocaml-dev
sudo apt-get -y install libmad-ocaml-dev
sudo apt-get -y install libtaglib-ocaml-dev
sudo apt-get -y install libvorbis-ocaml-dev
sudo apt-get -y install libsoundtouch-ocaml-dev
sudo apt-get -y install libsamplerate-ocaml-dev
sudo apt-get -y install libxmlplaylist-ocaml-dev
sudo apt-get -y install libdtools-ocaml-dev
sudo apt-get -y install libduppy-ocaml-dev
sudo apt-get -y install libpulse0 libpulse-dev

sudo apt-get -y install libasound2-dev
sudo apt-get -y install liblo liblo-dev
sudo apt-get -y install libmad0 libmad0-dev 
sudo apt-get -y install libspeex1 libspeex-dev
sudo apt-get -y install libtheora0 libtheora-dev
sudo apt-get -y install libvo-aacenc0 libvo-aacenc-dev
sudo apt-get -y install libfdk-aac0 libfdk-aac-dev
sudo apt-get -y install libsoundtouch0 libsoundtouch-dev
sudo apt-get -y install libsamplerate0 libsamplerate0-dev
sudo apt-get -y install libflac++-dev libflac++6 libflac8
sudo apt-get -y install liblame0 libmp3lame-dev
sudo apt-get -y install libmp3lame0 libmp3lame-dev
sudo apt-get -y install dssi-dev
sudo apt-get -y install libpulse0 libpulse-dev
sudo apt-get -y install libtag1c2a libtag1-dev
sudo apt-get -y install libvorbis0a libvorbis-dev
sudo apt-get -y install libopus0 libopus-dev
sudo apt-get -y install libfaad2 libfaad-dev

for non-free aac support see https://trac.ffmpeg.org/wiki/How%20to%20quickly%20compile%20libaacplus

git clone https://github.com/savonet/liquidsoap-full.git liquidsoap
cd liquidsoap
make init
make update

cp PACKAGES.default PACKAGES
vi PACKAGES

(commented are optional by our needs)

ocaml-cry
ocaml-alsa
ocaml-pulseaudio
#ocaml-gstreamer
ocaml-mad
ocaml-taglib
ocaml-lame
ocaml-ogg
ocaml-vorbis
#ocaml-speex
#ocaml-theora
ocaml-opus
#ocaml-schroedinger
ocaml-voaacenc
ocaml-fdkaac
ocaml-faad
ocaml-flac
ocaml-ladspa
ocaml-soundtouch
ocaml-samplerate
#ocaml-dssi
ocaml-xmlplaylist
#ocaml-lo
ocaml-dtools
ocaml-duppy
ocaml-mm
liquidsoap

we do not ues video so we remove following from PACKAGE

ocaml-gavl
ocaml-ffmpeg
ocaml-frei0r

build and install

./bootstrap
./configure --enable-debugging --disable-graphics
make clean
make
sudo make install

done

liquidsoap --version

Liquidsoap 1.2.0+scm (git://github.com/savonet/liquidsoap.git@d9d8fa569a5485dc1d8ba772c424611132785120:20160119:220304)
Copyright (c) 2003-2016 Savonet team
Liquidsoap is open-source software, released under GNU General Public License.
See <http://liquidsoap.fm> for more information.

install tools and libs before start of liquidsoap installation.
<code>
sudo apt-get -y install autoconf
sudo apt-get -y install libtool
sudo apt-get -y install g++
sudo apt-get -y install libxml-dom-perl
sudo apt-get -y install festival

sudo apt-get -y install libmagic-ocaml-dev
sudo apt-get -y install libcamomile-ocaml-dev
sudo apt-get -y install libxml-light-ocaml-dev
sudo apt-get -y install ocaml-compiler-libs
sudo apt-get -y install libfindlib-ocaml
sudo apt-get -y install libfindlib-ocaml-dev

sudo apt-get -y install libasound2-dev
sudo apt-get -y install libpulse-ocaml-dev
sudo apt-get -y install libmad-ocaml-dev
sudo apt-get -y install libtaglib-ocaml-dev
sudo apt-get -y install liblame0
sudo apt-get -y install libmp3lame-dev
sudo apt-get -y install libvorbis-ocaml-dev
sudo apt-get -y install libflac++-dev libflac++6 libflac8
sudo apt-get -y install libsoundtouch-ocaml-dev
sudo apt-get -y install libsamplerate-ocaml-dev
sudo apt-get -y install libxmlplaylist-ocaml-dev
sudo apt-get -y install libdtools-ocaml-dev
sudo apt-get -y install libduppy-ocaml-dev
sudo apt-get -y install libgstreamer1.0-0 libgstreamer1.0-dev
sudo apt-get install libgstreamer-plugins-base1.0-0 libgstreamer-plugins-base1.0-dev

#do not install used for Ubuntu 12.04 (but needed for 10.04!)
#sudo apt-get -y install libogg-ocaml-dev

#did not get acc running, yet
#sudo apt-get -y install libfaac-dev 
#sudo apt-get -y install libfaad-dev

additional libs not used in our PACKAGE file
#sudo apt-get -y install libao-ocaml-dev
#sudo apt-get -y install libschroedinger-dev libschroedinger-1.0-0
#sudo apt-get -y install libtheora-ocaml-dev
#sudo apt-get -y install libladspa-ocaml-dev

cd savonet
cp PACKAGES.default PACKAGES
vi PACKAGES

enable following modules in file PACKAGES should be enough for our purpose

ocaml-cry
ocaml-alsa
ocaml-pulseaudio
ocaml-mad
ocaml-taglib
ocaml-lame
ocaml-ogg
ocaml-vorbis
ocaml-flac
ocaml-ladspa
ocaml-soundtouch
ocaml-samplerate
ocaml-xmlplaylist
ocaml-dtools
ocaml-duppy
ocaml-mm
liquidsoap

#did not use / get running
#ocaml-theora
#ocaml-schroedinger
#ocaml-aacplus
#ocaml-voaacenc

  ./bootstrap 
  
*** bootstraping ocaml-cry-0.1.5
*** bootstraping ocaml-ao-0.2.0
*** bootstraping ocaml-alsa-0.2.0
*** bootstraping ocaml-pulseaudio-0.1.1
*** bootstraping ocaml-mad-0.4.0
*** bootstraping ocaml-taglib-0.1.3
*** bootstraping ocaml-lame-0.2.4
*** bootstraping ocaml-ogg-0.4.1
*** bootstraping ocaml-vorbis-0.5.1
*** bootstraping ocaml-theora-0.2.0
*** bootstraping ocaml-faac-0.1.2
*** bootstraping ocaml-faad-0.1.3
*** bootstraping ocaml-ladspa-0.1.2
*** bootstraping ocaml-soundtouch-0.1.5
*** bootstraping ocaml-samplerate-0.1.1
*** bootstraping ocaml-xmlplaylist-0.1.2
*** bootstraping ocaml-dtools-0.2.0
*** bootstraping ocaml-duppy-0.3.2
*** bootstraping liquidsoap-1.0.0-beta1

 ./configure --enable-debugging --disable-graphics
make
sudo make install

The ./configure result should look like this:

 ---------------------------------------------------------------- Installation

 prefix         : /usr/local
 exec_prefix    : ${prefix}
 binary         : ${exec_prefix}/bin
 configuration  : ${prefix}/etc/liquidsoap
 logging        : ${prefix}/var/log/liquidsoap
 PIDs           : ${prefix}/var/run/liquidsoap
 logrotate conf : ${prefix}/etc/logrotate.d
 man page       : ${datarootdir}/man/man1
 doc            : ${datarootdir}/doc

 -------------------------------------------------------------------- Features

 * Supported input formats
   - Vorbis            : yes
   - Theora            : yes
   - Speex             : no
   - Dirac             : no
   - MP3               : yes
   - AAC               : no
   - text-to-speech    : yes, using /usr/bin/text2wave
   - XML playlists     : yes
   - Lastfm            : no

 * Supported output formats
   - Vorbis            : yes
   - MP3               : yes
   - AAC               : no
   - AAC+              : no
   - SPEEX             : no
   - Theora            : yes
   - Dirac             : no

 * Tags
   - Taglib (ID3 tags) : yes
   - Vorbis            : yes
   - charset detection : yes

 * Input / output
   - Icecast/Shoutcast : yes
   - AO                : yes
   - OSS               : yes
   - ALSA              : yes
   - Portaudio         : no
   - Pulseaudio        : yes
   - JACK              : no
   - Old JACK          : no
   - V4L               : yes
   - opal              : no

 * Audio manipulation
   - Samplerate        : yes
   - SoundTouch        : yes
   - LADSPA            : yes

 * Video manipulation
   - Gavl              : no
   - camlimages        : no

 * MIDI manipulation
   - DSSI              : no

 * Visualization
   - Graphics          : no
   - OpenGL            : no
   - SDL               : no

 * Additional libraries
   - magic             : yes

 * Graphical interfaces
   - Python GUI        : yes (requires >=pyGTK-2.0)