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Install Dependencies

Debian / Ubuntu Server

apt-get install autoconf automake gawk g++ git-core libjpeg62-dev libncurses5-dev 
apt-get install libtool make python-dev gawk pkg-config libtiff4-dev libperl-dev libgdbm-dev libdb-dev unixodbc

Source

cd /usr/src
git clone  git://git.freeswitch.org/freeswitch.git freeswitch

Boostrap

cd /usr/src/freeswitch
./bootstrap.sh

Modules

cd /usr/src/freeswitch

Enable or disable the modules in /usr/src/freeswitch/modules.conf

Compile

./configure
make
make install