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

xbps-src: do not allow `/usr/share/man/man`
https://github.com/void-linux/void-packages/pull/38279

Description:
There is only a single package (`coturn`) using the directory because the `--manprefix` configure argument from the `gnu-configure` build style uses `/usr/share/man` while the configure script expected `/usr/share`.