Unable to build busybox with "pmbootstrap build"

I am trying to test out a patch I am writing for busybox, and have tried to build busybox through pmbootstrap for the armhf architecture. Here are the steps I followed:

1. Download busybox aports folder from upstream Alpine

2. copy it to pmbootstrap/aports/busybox

3. run pmbootstrap build --arch armhf

4. Full error log is in this gist: https://gist.github.com/craftyguy/bbf1b2dbb87003e98000b79db7e00c43

Running the build with 'native' (x86_64) succeeds.