>>> Emerging : portage://app-misc/graphlcd-base-2.0.3-r3:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ download  portage://app-misc/graphlcd-base-2.0.3-r3
             │           └─ file ─┤ 524.63 Kb  	 graphlcd-base-2.0.3.tar.gz
             │ download  portage://dev-libs/libhid-0.2.17-r1
             │           └─ file ─┤ 213.38 Kb  	 libhid-0.2.17.tar.gz
             │ 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
             │ download  portage://net-libs/libvncserver-0.9.15-r1
             │           └─ file ─┤ 586.32 Kb  	 LibVNCServer-0.9.15.tar.gz

Total: 5 actions (5 downloads), grouped into 1 step.
       2.23 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)