[CentOS] where is PD???

I am installed ORACLE software and it say server did NOT have PD:

Checking for make... found - /usr/bin/make Checking for ld... found - /usr/bin/ld Checking for cc... found - /usr/bin/cc Checking for ar... found - /usr/bin/ar Checking for ksh... Unable to find PD KSH version. Unable to locate all utilities with system path.

The server is CENTOS 5.1 with almost all software installed. Can anone tell me:

1. where is PD?

2. If I really NOT installed, which RPM should I load?

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