portage-ng --merge
>>> Emerging : portage://sys-libs/zlib-ng-2.2.5-r1:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sys-libs/zlib-ng-2.2.5-r1
│ └─ file ─┤ 2.31 Mb zlib-ng-2.2.5.tar.gz
└─step 2─┤ install portage://sys-libs/zlib-ng-2.2.5-r1
│ └─ conf ─┤ USE = "-compat -static-libs -test"
│ │ CPU_FLAGS_X86 = "avx2 avx512f pclmul sse2* sse4_2* ssse3* -avx512_vnni -vpclmulqdq"
└─step 3─┤ run portage://sys-libs/zlib-ng-2.2.5-r1
Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
2.31 Mb to be downloaded.