portage-ng --merge
>>> Emerging : portage://sys-firmware/ipxe-1.21.1:run?{[]}
These are the packages that would be merged, in order:
Calculating dependencies... done!
└─step 1─┤ download portage://sys-firmware/ipxe-1.21.1
└─step 2─┤ install portage://sys-firmware/ipxe-1.21.1
│ └─ conf ─┤ USE = "ipv6 qemu* binary -iso -lkrn -savedconfig -uefi -undi -usb -vmware"
└─step 3─┤ run portage://sys-firmware/ipxe-1.21.1
Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
0.00 Kb to be downloaded.