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

Calculating dependencies ... done!
Dependency resolution took 1.50 s (backtrack: 0/20).

[ebuild     UD ] dev-util/gperf-3.2.1::gentoo [3.3::gentoo] 1240 KiB

Total: 1 package (1 downgrade), Size of downloads: 1240 KiB