MarsSeed [1] filed a deletion request for sdl_sound-hg [2]: The sdl_sound source code has been migrated in 2021 [a] to GitHub [b].
This VCS package is obsolete now. [a]: http://icculus.org/SDL_sound/ [b]: https://github.com/icculus/SDL_sound [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/sdl_sound-hg/
