Ну зачем же сразу собирать. Подключи вместе с lenny еще и etch. Сделай apt-get update и поставь нужную версию. Пример:
apt-cache search firebird server classic
firebird2.0-classic - Firebird Classic Server - an RDBMS based on InterBase 6.0 code
firebird2.0-common - common files for firebird 2.0 servers and clients
firebird2.0-server-common - common files for firebird 2.0 servers
flamerobin - graphical database administration tool for Firebird DBMS
libfbclient2 - Firebird client library
libfbembed2 - Firebird embedded client/server library
firebird2-classic-server - Firebird Classic Server - an RDBMS based on InterBase 6.0 code
firebird2-server-common - Common files for Firebird servers
firebird2-utils-classic - Utilities for Firebird - an RDBMS based on InterBase 6.0 code
libfbclient1 - Firebird client library
libfbembed1 - Firebird embedded client/server libraryверсия из etch
apt-cache show firebird2-classic-server
...
Version: 1.5.3.4870-12
...
apt-get install firebird2-classic-server
...
The following NEW packages will be installed:
firebird2-classic-server firebird2-common firebird2-server-common libfbembed1
0 upgraded, 4 newly installed, 0 to remove and 12 not upgraded.
...
А это из lenny версия
apt-get install firebird2.0-classic
...
The following NEW packages will be installed:
firebird2.0-classic firebird2.0-common firebird2.0-server-common libeditline0 libfbembed2 libicu38 openbsd-inetd
0 upgraded, 7 newly installed, 0 to remove and 12 not upgraded.
...