As of 2020 April 13, the RMR manual pages are maintaind as separate document files on the Read The Docs (RTD) site. It is no longer necessary to build them if they are needed just for reference. The RTD link: https://docs.o-ran-sc.org/projects/o-ran-sc-ric-plt-lib-rmr/en/latest/index.html
The manual (man) pages for RMR are maintained as a part of the RMR source, and are available via several different avenues:
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