REHL 7 and Oracle Linux 7 was not released when Oracle database 18.104.22.168 came out, so the installer does give some issues in the pre-requisites and when installing the software. I advice to do a software only installation first, because of an issue that you will need to fix with a patch after software installation, but before creating a database.
These issues popped-up when I was installing a 22.214.171.124 database on RHEL7 (not a Certified product combination!), but the solutions given for 126.96.36.199 worked for it as well:
- elfutils-libelf-devel package missing;
- compat-libstdc++ package missing;
- pdksh package missing;
- “Error in invoking target ‘agent nmhs’ of makefile” when installing.
- This one also counts for installing Oracle Fusion Middleware.