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There are three different problems being addressed here: 1. Recent Folly versions depend on liburing features that have not yet been released. 2. Folly has no build system configuration option to disable io_uring support. 3. Folly's CMake build system will unconditionally add liburing as a library to link against, which downstream Facebook libraries rely on. The third one creates an implicit dependency between Folly and liburing which means if liburing gets depcleaned or otherwise unmerged, other Facebook packages will fail to build. We solve this by conditionally patching out io_uring support based on USE=io-uring and having a (currently technically invalid) dependency on the yet-unreleased liburing-2.10, which will make it automagically start working once we do have that release in ::gentoo. Ref: https://github.com/facebook/folly/issues/2420 Bug: https://bugs.gentoo.org/954335 Signed-off-by: sin-ack <sin-ack@protonmail.com> Part-of: https://github.com/gentoo/gentoo/pull/41734 Signed-off-by: Sam James <sam@gentoo.org>