Shareplex installation errors out with "The Oracle home entered is not Oracle 10g home" (4330244)

While Installing Shareplex when there is no corresponding Oracle installation existing, the following error occurs:
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Enter Oracle 100 SID[ ]: <entered a dummy SID here>
Enter Oracle home directory or press Enter to use [/u01/app/oracle/product/9.2]: <entered a dummy ORACLE_HOME here>
==> The Oracle home entered is not Oracle 10g home.

Please, provide 10g ORACLE_HOME directory, or press-X to terminate installation:[X]

Oracle needs to be installed prior to installing Shareplex

Please install Oracle prior to installing Shareplex.