From Gentoo Wiki
USE flags for kde-apps/konsole KDE's terminal emulator
|Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see https://wiki.gentoo.org/wiki/Project:Quality_Assurance/Backtraces
|Enable handbooks generation for packages by KDE
|Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)
emerge --ask kde-apps/konsole
To make the title of a process running in Konsole (e.g. emerge) visible in the tab title or window titlebar, add
%w (window title set by shell) to the Tab title format, under 'Tabs' in the Konsole profile.