$sudo apt-get install automake libtool libreadline5-dev make btyacc bison gawk g++
$wget http://garr.dl.sourceforge.net/sourceforge/firebird/Firebird-2.1.0.17755-ReleaseCandidate2.tar.bz2
$tar -jxvf Firebird-2.1.0.17755-ReleaseCandidate2.tar.bz2
$cd Firebird-2.1.0.17755-ReleaseCandidate2
$./configure --enable-super-server --prefix=/opt/firebird2.1
$make
$sudo make install
.:(
firebird):..:(
databases):..:(
sql):.