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

https://github.com/Johnnynator/void-packages riscv64-bits
https://github.com/void-linux/void-packages/pull/45276

xbps-src/common: add riscv64 profiles
- go: add riscv64
- build-style/cmake.sh: add riscv64 arch
- [WIP] add configure/autoconf_cache/riscv64-linux
- add riscv64 profiles

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A patch file from https://github.com/void-linux/void-packages/pull/45276.patch is attached