failed to run /usr/bin/make [make olddefconfig]: exit status 2 YACC scripts/kconfig/zconf.tab.c LEX scripts/kconfig/zconf.lex.c /bin/sh: 1: flex: not found scripts/Makefile.lib:204: recipe for target 'scripts/kconfig/zconf.lex.c' failed make[1]: *** [scripts/kconfig/zconf.lex.c] Error 127 Makefile:506: recipe for target 'olddefconfig' failed make: *** [olddefconfig] Error 2