>>> Emerging : portage://app-text/mdbook-0.5.4:run?{[]}

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

Calculating dependencies... done!

 └─step  1─┤ download  portage://app-text/mdbook-0.5.4
             │           └─ file ─┤ 8.18 Mb  	 mdbook-0.5.4-vendor.tar.xz
             │                    │ 960.57 Kb  	 mdbook-0.5.4.tar.gz

 └─step  2─┤ install   portage://app-text/mdbook-0.5.4
             │           └─ conf ─┤ USE = "-debug -doc"

 └─step  3─┤ run     portage://app-text/mdbook-0.5.4

Total: 3 actions (1 download, 1 install, 1 run), grouped into 3 steps.
       9.12 Mb to be downloaded.