buildroot/package/bison/Config.in

config BR2_PACKAGE_BISON
	bool "bison"
	depends on BR2_USE_WCHAR
	select BR2_PACKAGE_M4
	help
	  General-purpose parser generator that converts a
	  grammar description for an LALR context-free grammar into a C
	  program to parse that grammar.

	  http://www.gnu.org/software/bison/

comment "bison requires a toolchain with WCHAR support"
	depends on !BR2_USE_WCHAR