>>> Emerging : portage://dev-build/xfce4-dev-tools-4.21.1:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ unmask  portage://dev-build/xfce4-dev-tools-4.21.1

 └─step  2─┤ download  portage://dev-build/xfce4-dev-tools-4.21.1
             │           └─ file ─┤ 404.90 Kb  	 xfce4-dev-tools-4.21.1.tar.bz2

Total: 2 actions (1 unmask, 1 download), grouped into 2 steps.
       404.90 Kb to be downloaded.


>>> Assumptions taken during proving & planning:

  Package unmask (1 package):
  Add to /etc/portage/package.unmask:
    =dev-build/xfce4-dev-tools-4.21.1