This is a copy of the kconfig code in the kernel (currently 4.17-rc2) tweaked to suit Buildroot. To update: cp -r /usr/src/linux/scripts/kconfig support/kconfig.new cd support/kconfig.new # zconf.lex.c and zconf.tab.c needs to be generated by 'make menuconfig' mv zconf.lex.c zconf.lex.c_shipped mv zconf.tab.c zconf.tab.c_shipped rm -rf tests/ cp -a ../kconfig/patches ../kconfig/README.buildroot ../kconfig/.gitignore . quilt push -a # Fix any conflict cd .. rm -rf kconfig mv kconfig.new kconfig Then verify the toplevel targets work: config defconfig menuconfig nconfig xconfig gconfig oldconfig