@Jonathan-Rizzo

I figured this out myself, so hopefully it's all correct. But it works :)

Make sure your shell is in the source directory Run: "./scripts/feeds install <<your lib>>" Often this works. If it doesn't we will install manually. mkdir -p package/libs/<<your lib>> cd package/libs/<<your lib>> wget https://raw.githubusercontent.com/openwrt/packages/master/libs/<<your lib>>/Makefile cd ../../../ make package/libs/<<your-lib>>/compile make package/libs/<<your-lib>>/install make package/libs/<<your-lib>>/clean

More information here:
https://openwrt.org/docs/guide-developer/build-system/start

Secondly, this may be a cleaner way to do it, but I haven't tried:
https://navneetstudynotes.blogspot.com/2015/04/building-new-package-with-openwrt.html