portage-ng --merge
>>> Emerging : portage://app-text/build-docbook-catalog-2.3-r1:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://app-text/build-docbook-catalog-2.3-r1
│ └─ file ─┤ 4.58 Kb build-docbook-catalog-2.3.tar.bz2
└─step 2─┤ downgrade portage://app-text/build-docbook-catalog-2.3-r1 (replaces pkg://app-text/build-docbook-catalog-2.4)
└─step 3─┤ run portage://app-text/build-docbook-catalog-2.3-r1
Total: 3 actions (1 download, 1 downgrade, 1 run), grouped into 3 steps.
4.58 Kb to be downloaded.