portage-ng --merge
>>> Emerging : portage://app-text/doxygen-1.18.0-r1:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://app-text/doxygen-1.18.0-r1
│ └─ file ─┤ 9.45 Mb doxygen-1.18.0.src.tar.gz
│ download portage://dev-lang/python-3.15.0
│ └─ file ─┤ 34.04 Mb Python-3.15.0.tar.xz
│ │ 4.52 Kb python-gentoo-patches-3.15.0.tar.xz
└─step 2─┤ install portage://dev-lang/python-3.15.0
│ └─ conf ─┤ USE = "gdbm* ncurses pgo* readline sqlite* ssl ensurepip (-jit) -bluetooth -build% -debug -examples -libedit
│ │ -tail-call-interp -test -tk -valgrind -verify-sig"
│ │ LLVM_SLOT = "21%*"
│ │ SLOT = "3.15"
└─step 3─┤ update portage://app-text/doxygen-1.18.0-r1 (replaces pkg://app-text/doxygen-1.16.1)
│ └─ conf ─┤ USE = "-clang -debug -doc -dot -doxysearch -gui -test"
│ │ LLVM_SLOT = "22* -18 -19 -20 -21*"
└─step 4─┤ run portage://app-text/doxygen-1.18.0-r1
Total: 5 actions (2 downloads, 1 install, 1 update, 1 run), grouped into 4 steps.
43.49 Mb to be downloaded.