There is an updated pull request by bra1nwave against master on the void-packages repository

https://github.com/bra1nwave/void-packages gnuradio
https://github.com/void-linux/void-packages/pull/21192

[WIP] gnuradio: update to 3.8.1.0.
Build logs: [x86_64](http://sprunge.us/GBn9IO) | [i686](http://sprunge.us/ageryi) | [x86_64-musl](http://sprunge.us/b6HGX7) | [armv7l](http://sprunge.us/mIFIGG)

A patch file from https://github.com/void-linux/void-packages/pull/21192.patch is attached