Reported by Joerg Fischer:

:~/external> cp ~/Downloads/Firebird-2.5.0.26074-0.tar.bz2 .
:~/external> bunzip2 Firebird-2.5.0.26074-0.tar.bz2
:~/external> tar -xvf Firebird-2.5.0.26074-0.tar
:~/external> cd Firebird-2.5.0.26074-0/
:~/external/Firebird-2.5.0.26074-0> ./configure --enable-superserver

                   Architecture : SuperServer
                          Debug : disabled
64 bit I/O for 32-bit platforms : enabled
                    Raw devices : enabled
                   Service name : gds_db
                   Service port : 3050
                   GPRE modules : c_cxx.cpp

                    Install Dir : /usr/local/firebird

:~/external/Firebird-2.5.0.26074-0> make
:~/external/Firebird-2.5.0.26074-0> su
Password:
:/home/jofi/external/Firebird-2.5.0.26074-0 # make install
Firebird super 2.5.0.26074-0.i686 Installation

Press Enter to start installation or ^C to abort
Extracting install data
firebird 0:off 1:off 2:on 3:on 4:off 5:on 6:off
Starting Firebird failed

Fixing firebird's shell to /bin/sh

Starting Firebird failed
Please enter new password for SYSDBA user: masterkey
Please enter new password for SYSDBA user:
Warning - maximum 8 significant bytes of password used
use gsec -? to get help
Unable to complete network request to host "localhost".
Failed to establish a connection.
unable to open database

Please enter new password for SYSDBA user: ^Cmake[2]: *** [install] Interrupt
make[1]: *** [install] Interrupt
make: *** [install] Interrupt

:/home/jofi/external/Firebird-2.5.0.26074-0 # less /usr/local/firebird/firebird.log

linux-7wjm (Client) Tue Nov 23 16:47:35 2010
        /usr/local/firebird/bin/fbguard: guardian starting /usr/local/firebird/bin/fbserver



linux-7wjm (Server) Tue Nov 23 16:47:35 2010
        ConfigStorage: Cannot initialize the shared memory region
        operating system directive open failed
        Permission denied


linux-7wjm (Server) Tue Nov 23 16:47:35 2010
        ConfigStorage: Cannot initialize the shared memory region
        operating system directive open failed
        Permission denied


linux-7wjm (Server) Tue Nov 23 16:47:35 2010
        Database: /usr/local/firebird/security2.fdb
        operating system directive open failed
        Permission denied


linux-7wjm (Client) Tue Nov 23 16:47:35 2010
        /usr/local/firebird/bin/fbguard: /usr/local/firebird/bin/fbserver terminated due to startup error (2)



linux-7wjm (Client) Tue Nov 23 16:47:35 2010
        /usr/local/firebird/bin/fbguard: /usr/local/firebird/bin/fbserver terminated due to startup error (2)



linux-7wjm (Client) Tue Nov 23 16:47:36 2010
        /usr/local/firebird/bin/fbguard: guardian starting /usr/local/firebird/bin/fbserver



linux-7wjm (Server) Tue Nov 23 16:47:36 2010
        ConfigStorage: Cannot initialize the shared memory region
        operating system directive open failed
        Permission denied


linux-7wjm (Server) Tue Nov 23 16:47:36 2010
        ConfigStorage: Cannot initialize the shared memory region
        operating system directive open failed
        Permission denied


linux-7wjm (Server) Tue Nov 23 16:47:36 2010
        Database: /usr/local/firebird/security2.fdb
        operating system directive open failed
        Permission denied


linux-7wjm (Client) Tue Nov 23 16:47:36 2010
        /usr/local/firebird/bin/fbguard: /usr/local/firebird/bin/fbserver terminated due to startup error (2)



linux-7wjm (Client) Tue Nov 23 16:47:36 2010
        /usr/local/firebird/bin/fbguard: /usr/local/firebird/bin/fbserver terminated due to startup error (2)



linux-7wjm (Client) Tue Nov 23 16:48:05 2010
        INET/inet_error: connect errno = 111