portage-ng --merge
>>> Emerging : portage://sci-libs/gamer-1.5-r2:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://dev-libs/maloc-1.5-r1
│ └─ file ─┤ 775.53 Kb maloc-1.5.tar.gz
│ download portage://sci-libs/gamer-1.5-r2
│ └─ file ─┤ 4.04 Mb gamer-1.5.tar.gz
└─step 2─┤ install portage://dev-libs/maloc-1.5-r1
│ └─ conf ─┤ USE = "-doc -mpi"
└─step 3─┤ run portage://dev-libs/maloc-1.5-r1
└─step 4─┤ install portage://sci-libs/gamer-1.5-r2
│ └─ conf ─┤ USE = "-doc"
└─step 5─┤ run portage://sci-libs/gamer-1.5-r2
Total: 6 actions (2 downloads, 2 installs, 2 runs), grouped into 5 steps.
4.79 Mb to be downloaded.