Alpine host systen bin/usign not found

For Developers
1

Trying to build for target mt7621.

make log:

...
Signing package index...
bash: line 4: /home/ru/openwrt/staging_dir/host/bin/usign: No such file or directory
bash: line 4: /home/ru/openwrt/staging_dir/host/bin/usign: No such file or directory
2

Are you able to build the usign package?

make package/usign/{clean,compile} -j1 V=s

Check for warnings, errors, etc.