I write the wrong name in the previous post. The library name is
libstdc++.so.5.

[root@servidor src]# rpm -ivh FirebirdCS-1.5.0.2658-0.Beta3.i686.rpm
Preparing...
########################################### [100%]
1:FirebirdCS
########################################### [100%]
saving previous /etc/firebird.conf
as /etc/firebird.conf.20030311_1712
/usr/local/firebird/bin/gsec: error while loading shared libraries:
libstdc++.so.5: cannot load shared object file: No such file or
directory
error: execution of %post scriptlet from FirebirdCS-1.5.0.2658-
0.Beta3 failed, exit status 127
[root@servidor src]#