After some investigation with sergidj, we found out that this happens because the off_t type is being configured to be 72-bit long by cmake. After some investigation, we found out that the build of an embedded library injects a hook into cmake to call "node" (JS) with the "--experimental-wasm-threads" option (this is a Debian patch).
This option has been removed from node 20 and node now exits with a code 9 error. This error code ends up being propageted during the embeded library cmake checks, which ends up being set as the size of off_t (9 bytes), leading to a build failure later on. This is also reported in Ubuntu in https://bugs.launchpad.net/debian/+source/node-yarnpkg/+bug/2068769 -- Athos Ribeiro
