portage-ng --merge
>>> Emerging : portage://dev-cpp/cairomm-1.18.1:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://dev-cpp/cairomm-1.18.1
│ └─ file ─┤ 599.34 Kb cairomm-1.18.1.tar.xz
│ download portage://dev-libs/libsigc++-3.8.0
│ └─ file ─┤ 972.23 Kb libsigc++-3.8.0.tar.xz
└─step 2─┤ install portage://dev-libs/libsigc++-3.8.0
│ └─ conf ─┤ USE = "-gtk-doc -test"
│ │ SLOT = "3"
└─step 3─┤ run portage://dev-libs/libsigc++-3.8.0
└─step 4─┤ install portage://dev-cpp/cairomm-1.18.1
│ └─ conf ─┤ USE = "X* -gtk-doc -test"
│ │ SLOT = "1.16"
└─step 5─┤ run portage://dev-cpp/cairomm-1.18.1
Total: 6 actions (2 downloads, 2 installs, 2 runs), grouped into 5 steps.
1.53 Mb to be downloaded.