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

id3lib: patch for c99 bool
https://github.com/void-linux/void-packages/pull/39275

Description:
id3/globals.h has a typedef for bool which is incompatible with c99 stdbool.
This is a known issue, but upstream is effectively unmaintained.
See [this thread](https://sourceforege.net/p/id3lib/mailman/message/30500558/) from upstream.

This only seems to be an issue for castget while building, and they have already switched to using taglib for the next release.
Castget [issue](https://github.com/mlj/castget/issues/47).

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