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USE flags

• debug - 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
• gsl - Use the GNU scientific library for calculations
• handbook - Enable handbooks generation for packages by KDE
• nls - Add Native Language Support (using gettext - GNU locale utilities)
• qalculate - Enable the libqalculate library for unit conversion
• test - Enable dependencies and/or preparations necessary to run tests (usually controlled by FEATURES=test but can be toggled independently)