@nothingface0 From the first post, your default Python version seems to be “Python 3.8.3”.
However, I have now found two different machines which run “CentOS Stream release 8” and “Rocky Linux release 8.6 (Green Obsidian)”, and both of them provide “Python 2.7.18” and “Python 3.6.8” (to my surprise, the same as on old CentOS 7 / RHEL 7).
So, try: find ${ROOTSYS} -name "libcppyy*.so"