These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] sys-block/libfabric-2.3.1-r1:0/1::gentoo  USE="-cuda -efa -io-uring -rocm -ucx -usnic -verbs" 2975 KiB

Total: 1 package (1 new), Size of downloads: 2975 KiB