building firebird 2.1 from debian git repository

apt-get install libicu-dev libedit-dev git-core

you need to check out the firebird 2.1 repository from debian git

http://lists.alioth.debian.org/pipermail/pkg-firebird-general/2007q3/001125.html

git-clone git://git.debian.org/git/pkg-firebird/2.1
cd 2.1
debuild -i
and wait for it to build it for you

.:(firebird):..:(databases):..:(sql):.