Thanks. mipu:
I did find the "compat-openssl11" package within the AppStream repository for RHEL 9 and was able to complete the build, but when I try to start the "eraagent" service, it still complains about the library: Service run-time failed with: An error occurred during OpenSSL initialization, reason: required library function not found, error: 0x00001B68
I have also seen some core dumps of the "efs" service.
Although not officially supported, I was hoping the ESET software would work with RHEL 9, but it appears there are issues that need to be sorted out. I will have to make use of RHEL 8 or maybe switch to Debian 11, both of which are among the list of supported operating systems.