Hi Everyone. If you are installing DB version 12.1.0.* there are some problems. Oracle 12c (12.1.0.*) installs cleanly. Database version : 12.1.0.* Operating Systems Version : Oracle Linux 7.x You will see the following error. To fix it, do the following: Perform the following modifications to the “$ORACLE_HOME/rdbms/lib/env_rdbms.mk” file. Have a good day.