Opera 12.10 calls out for GLIBC_2.8. So using the repackaged rpms in the snapshot folder is not possible. Using the information provided by the article I used a Fedora 20 system to rpmrebuild and then put it on my Red Hat system. Unfortunately I still could not install that version of Opera. It is now calling out
rpmlib(FileDigests) <= is needed by opera-12.02... Same this with the last version of Opera 11.
Looks like my Red Hat system is is maybe too old? Thanks again for your initial responses. I probably will not pursue this any further. Cheers.