>>> Emerging : portage://dev-embedded/avrdude-7.2:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ download  portage://dev-embedded/avrdude-7.2
             │           └─ file ─┤ 2.50 Mb  	 avrdude-7.2.tar.gz
             │ 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
             │ download  portage://dev-libs/libusb-compat-0.1.9
             │           └─ file ─┤ 321.19 Kb  	 libusb-compat-0.1.9.tar.bz2

Total: 4 actions (4 downloads), grouped into 1 step.
       3.79 Mb to be downloaded.



Error The proof for your build plan contains domain assumptions. Please verify:


>>> Domain assumptions

- Other: 
  unreachable(portage://dev-libs/libusb-compat-0.1.9:install,portage://virtual/libusb-0-r2:install)