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

https://github.com/tornaria/void-packages mpir
https://github.com/void-linux/void-packages/pull/41179

mpir: remove package
This package is dead, and not used in void linux. It was included in makedepends for gnuradio but it's not really used (gmp is used instead).

Cc: @abenson

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A patch file from https://github.com/void-linux/void-packages/pull/41179.patch is attached