I will have to install firebird 2.1 (preferably latest 2.1.7) on
64-bit RHEL/CentOS 6 based linux. (I understand 2.1 is discontinued,
but some program vendors don't).

The rpm and tar.gz packages from firebird.sql seem to fail [at least]
because of libstdc++ - if I understand correctly, they need
libstdc++.so.5 while I have libstdc++.so.6

I couldn't find an rpm or pre-compiled 2.1.7 binary for RHEL/CentOS6,
but maybe I didn't know how and where to look. Can anyone suggest
anything else to try before I start trying to compile from sources?
(Never done that and have the impression it may not be that easy).

Thanks
Emil