How to make package depend on a busybox config

For Developers
1

As per the thread title.
I need a package Makefile to specify that it DEPENDS on CONFIG_BUSYBOX_DEFAULT_SHA1SUM.

I couldn’t find a suitable example in other packages sorry, so I hoped someone would be able to give me a quick answer.

2

I assume it would be something similar to

package/system/zram-swap/Makefile: DEPENDS:=+kmod-zram +!BUSYBOX_CONFIG_MKSWAP:swap-utils +!BUSYBOX_CONFIG_SWAPONOFF:block-mount

Alternatively you can put it in a Config.in.

Also I don't think CONFIG_BUSYBOX_DEFAULT_SHA1SUM is the correct dependency, but I don't fully understand the naming. Possibly BUSYBOX_CONFIG_SHA1SUM.