Created attachment 274739 [details] buildlog for amd64 On a new install this failure occurred ,fatal missing file glib-unix.h. A search of the system did not reveal the named file. Restarted the emerge,a couple of extra files were compiled,then upower again failed ,same reason. I then selected upower-0.9.9 and this compiled up ok.
Created attachment 274741 [details] emerge info amd64
Your tree is out of date - it's already fixed (and fixed upstream in 0.9.11).