portage-ng --merge
>>> Emerging : portage://sci-biology/velvet-1.2.10:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sci-biology/velvet-1.2.10
│ └─ file ─┤ 17.95 Mb velvet_1.2.10.tgz
└─step 2─┤ install portage://sci-biology/velvet-1.2.10
│ └─ conf ─┤ USE = "openmp -doc"
└─step 3─┤ run portage://sci-biology/velvet-1.2.10
Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
17.95 Mb to be downloaded.