The most tricky paristo make your amd64 system install i386 packages in order to have Firebird running.
Let's start by running dpkg and add i386 as new architecture.
Reference here
dpkg --add-architecture i386
change /etc/apt/sources.list
(exemple bellow)
deb [arch=amd64,i386] http://ftp.br.debian.org/debian/ stretch main
deb-src [arch=amd64,i386] http://ftp.br.debian.org/debian/ stretch main
deb [arch=amd64,i386] http://security.debian.org/debian-security stretch/updates main
deb-src [arch=amd64,i386] http://security.debian.org/debian-security stretch/updates main
# stretch-updates, previously known as 'volatile'
deb [arch=amd64,i386] http://ftp.br.debian.org/debian/ stretch-updates main
deb-src [arch=amd64,i386] http://ftp.br.debian.org/debian/ stretch-updates main
---
Install the required packages
apt install lib32ncurses5
apt install libstdc++5:i386
--
Check with ldd if the library are working fine...
ldd /opt/firebird/lib/libfbclient.so
linux-gate.so.1 (0xf7746000)
libstdc++.so.5 => /usr/lib/i386-linux-gnu/libstdc++.so.5 (0xf7606000)
libncurses.so.5 => /lib32/libncurses.so.5 (0xf75e1000)
libcrypt.so.1 => /lib/i386-linux-gnu/libcrypt.so.1 (0xf75af000)
libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0xf755a000)
libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0xf73a2000)
libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0xf739d000)
libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0xf7380000)
libgcc_s.so.1 => /lib/i386-linux-gnu/libgcc_s.so.1 (0xf7362000)
libtinfo.so.5 => /lib32/libtinfo.so.5 (0xf733f000)
/lib/ld-linux.so.2 (0xf7748000)
