portage-ng --merge
>>> Emerging : portage://sci-libs/atlas-3.10.3:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sci-libs/atlas-3.10.3
│ └─ file ─┤ 4.92 Mb atlas3.10.3.tar.bz2
└─step 2─┤ install portage://sci-libs/atlas-3.10.3
│ └─ conf ─┤ USE = "threads* -doc -fortran -generic -lapack -static-libs"
└─step 3─┤ run portage://sci-libs/atlas-3.10.3
Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
4.92 Mb to be downloaded.