portage-ng --merge
>>> Emerging : portage://app-shells/zsh-5.9.2:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://app-shells/zsh-5.9.2
│ └─ file ─┤ 3.28 Mb zsh-5.9.2.tar.xz
└─step 2─┤ update portage://app-shells/zsh-5.9.2 (replaces pkg://app-shells/zsh-5.9.0.3-r2)
│ └─ conf ─┤ USE = "gdbm* pcre -caps -debug -doc -examples -maildir -static -valgrind -verify-sig%"
└─step 3─┤ run portage://app-shells/zsh-5.9.2
Total: 3 actions (1 download, 1 update, 1 run), grouped into 3 steps.
3.28 Mb to be downloaded.