portage-ng --merge
>>> Emerging : portage://sci-astronomy/skymaker-3.10.5:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sci-astronomy/skymaker-3.10.5
│ └─ file ─┤ 497.01 Kb skymaker-3.10.5.tar.gz
│ download portage://sci-libs/fftw-3.3.10-r1
│ └─ file ─┤ 3.95 Mb fftw-3.3.10.tar.gz
└─step 2─┤ install portage://sci-libs/fftw-3.3.10-r1
│ └─ conf ─┤ USE = "openmp threads* (-zbus) -doc -fortran -mpi -test"
│ │ CPU_FLAGS_X86 = "avx avx2 fma3 sse* sse2* -fma4"
│ │ SLOT = "3.0/3"
└─step 3─┤ run portage://sci-libs/fftw-3.3.10-r1
└─step 4─┤ install portage://sci-astronomy/skymaker-3.10.5
│ └─ conf ─┤ USE = "threads*"
└─step 5─┤ run portage://sci-astronomy/skymaker-3.10.5
Total: 6 actions (2 downloads, 2 installs, 2 runs), grouped into 5 steps.
4.44 Mb to be downloaded.