Thanks to Cristian Ionescu-Idbohrn for noticing this.
default "package/busybox/busybox-1.5.0.config" if BR2_BUSYBOX_VERSION_1_5_0
default "package/busybox/busybox-1.5.0.config" if BR2_BUSYBOX_VERSION_1_5_1
default "package/busybox/busybox-1.6.0.config" if BR2_BUSYBOX_VERSION_1_6_0
+ default "package/busybox/busybox-1.6.0.config" if BR2_BUSYBOX_VERSION_1_6_1
help
Some people may wish to use their own modified BusyBox configuration
file, and will specify their config file location with this option.