Oracle client is installed on the machine 9.2.0, and I am able to access the database using SQLPLUS.
Here are my variables for the same :
ORACLE_HOME /export/apps/oracli/DSM/9.2.0
LB_LIBRARY_PATH /export/apps/oracli/DSM/9.2.0/lib32
Also I couldn't locate "oracle.mk" anywhere in the oracle install dir. I never expected it because even in the "working" machine, I don't see oracle.mk file.