portage-ng --merge
>>> Emerging : portage://sci-libs/colpack-1.0.10_p20190621:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sci-libs/colpack-1.0.10_p20190621
│ └─ file ─┤ 675.47 Kb colpack-1.0.10_p20190621.tar.gz
└─step 2─┤ install portage://sci-libs/colpack-1.0.10_p20190621
│ └─ conf ─┤ USE = "openmp"
└─step 3─┤ run portage://sci-libs/colpack-1.0.10_p20190621
Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
675.47 Kb to be downloaded.