Build error when BR2_PACKAGE_IOSTAT=y is in the .config. Makefile.legacy:9: *** "You have legacy configuration in your .config! Please check your configuration.". Stop. Makefile:23: recipe for target '_all' failed make: *** [_all] Error 2 When removed start the build. Is this replaced or removed?
iostat has been dropped since https://git.buildroot.net/buildroot/commit/?id=281e5af3481378c91e71506560f1556d9525450f because it is not maintained anymore (even upstream site is dead). I would advise to enable sysstat which also provides iostat.