R12 Clone Error - Unable to find PD KSH version

ERROR  :: Checking for make...    found - /usr/bin/make

Checking for ld...     found - /usr/bin/ld

Checking for gcc...    found - /usr/bin/gcc

Checking for g++...    found - /usr/bin/g++

Checking for ar...     found - /usr/bin/ar

Checking for ksh...

Unable to find PD KSH version.

Unable to locate all utilities with system path.

PATH = /u01/*******/db/tech_st/11.2.3/appsutil/clone/bin/../jre/bin:/usr/bin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin

Solution :: export KSH_VERSION='@(#)PD KSH v5.2.14 99/07/13.2'