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

wpa_supplicant: enable 802.11v support
https://github.com/void-linux/void-packages/pull/38987

Description:
Set CONFIG_WNM to enable better roaming.

Follows identical config change by other distros:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=886414
https://github.com/NixOS/nixpkgs/pull/158174
https://bugs.archlinux.org/task/65470

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