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

Calculating dependencies ... done!
Dependency resolution took 1.52 s (backtrack: 0/20).

[ebuild     U  ] media-libs/openjpeg-2.5.4-r1:2/7::gentoo [2.5.4:2/7::gentoo] USE="-doc -test" 2107 KiB

Total: 1 package (1 upgrade), Size of downloads: 2107 KiB