EAPI 2_pre0 USE Dependencies Conditional USE Dependencies Syntax Examples Compact Form Equivalent Expanded Form foo[bar?] foo bar? ( foo[bar] ) foo[-bar?] foo !bar? ( foo[-bar] ) foo[bar=] foo bar? ( foo[bar] ) !bar? ( foo[-bar] ) foo[bar!=] foo bar? ( foo[-bar] ) !bar? ( foo[bar] )