There's a closed pull request on the void-packages repository

[WIP] memtest86+: update to 5.31b
https://github.com/void-linux/void-packages/pull/21179

Description:
* work in progress upstream, definitively not a stable release
* build fine from x86_64/musl
* run fine on my i5-5300U CPU @ 2.30GHz, 8GB RAM, both fail-safe and SMP modes
* glitches on % calculations (test #8 advancement, overall is 100% on hitting test 8/11)
* 32bit / glibc: pentium M 1.5 GHz: build and run fine, same glitches