>>> Emerging : portage://app-crypt/libu2f-server-1.1.0-r2:run?{[]}

These are the packages that would be merged, in order:

Calculating dependencies... done!

 └─step  1─┤ download  portage://app-crypt/libu2f-server-1.1.0-r2
             │           └─ file ─┤ 262.82 Kb  	 libu2f-server-1.1.0.tar.xz
             │ download  portage://dev-libs/hidapi-0.15.0
             │           └─ file ─┤ 355.31 Kb  	 hidapi-0.15.0.tgz
             │ download  portage://dev-libs/libusb-1.0.30
             │           └─ file ─┤ 640.73 Kb  	 libusb-1.0.30.tar.bz2

 └─step  2─┤ install   portage://dev-libs/libusb-1.0.30
             │           └─ conf ─┤ USE = "-debug -doc -examples -static-libs -test -udev -verify-sig"
             │                    │ SLOT = "1"

 └─step  3─┤ run       portage://dev-libs/libusb-1.0.30

 └─step  4─┤ install   portage://virtual/libusb-1-r2
             │           └─ conf ─┤ USE = "-udev"
             │                    │ SLOT = "1"

 └─step  5─┤ run       portage://virtual/libusb-1-r2

 └─step  6─┤ install   portage://dev-libs/hidapi-0.15.0
             │           └─ conf ─┤ USE = "-doc"

 └─step  7─┤ run       portage://dev-libs/hidapi-0.15.0

 └─step  8─┤ install   portage://app-crypt/libu2f-server-1.1.0-r2
             │           └─ conf ─┤ USE = "-static-libs -test"
             │                    │ SLOT = "0/0.1"

 └─step  9─┤ run     portage://app-crypt/libu2f-server-1.1.0-r2

Total: 11 actions (3 downloads, 4 installs, 4 runs), grouped into 9 steps.
       1.23 Mb to be downloaded.