Not sure if I should mention this here or at right-click.
When recently trying to build with v22.214.171.124 of oiio I discovered an issue that is now fixed for the next oiio release.
While this oiio fix will allow cycles to build with oiio 2.1.11, the issue was due to cycles using
oiio::unordered_map_concurrent. It was suggested here that using
stl::robin_map would offer performance improvements as well as matching the intended use of oiio.