portage-ng --merge
>>> Emerging : portage://sys-apps/diffutils-3.10:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sys-apps/diffutils-3.10
│ └─ file ─┤ 1.55 Mb diffutils-3.10.tar.xz
└─step 2─┤ downgrade portage://sys-apps/diffutils-3.10 (replaces pkg://sys-apps/diffutils-3.12)
│ └─ conf ─┤ USE = "nls -verify-sig"
└─step 3─┤ run portage://sys-apps/diffutils-3.10
Total: 3 actions (1 download, 1 downgrade, 1 run), grouped into 3 steps.
1.55 Mb to be downloaded.