Oracle 9i is not officially supported on RHEL 5 or CentOS 5, consider upgrading to 10g or downgrading to RHEL 4 or Centos 4.
Unofficially, there's a simple workaround. Apart from the usual install procedure, execute the following before you start runInstall:
# rpm -ivh compat-libcwait-2.1-1.i386.rpm
# rpm -ivh compat-oracle-rhel4-1.0-5.i386.rpm --nodeps
# cd /usr/lib
# ln -s libstdc++-3-libc6.2-2-2.10.0.so libstdc++-libc6.1-1.so.2
# cd /usr/bin
# ln -s gcc34 gcc32
Notice the --nodeps clause, the unresolved dependencies should be harmless as long as you've installed all the packages mentioned in the installation guide. Notably, the xorg-x11-deprecated-libs packages are no longer needed nor available.
For more info, see:
http://forums.oracle.com/forums/thread.jspa?threadID=662261