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

https://github.com/Chocimier/void-packages-org hostmakedepends-pattern
https://github.com/void-linux/void-packages/pull/38540

xbps-src: explicitly disallow pattern on build deps
It is not possible to use version other than currently in template.

Specifying pattern breaks build if dependency isn't in binary repo
already. That it worked when in repo was a coincidence.

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A patch file from https://github.com/void-linux/void-packages/pull/38540.patch is attached