Like the related sonic2013-git package, I believe this was flagged as out-of-date erroneously.
Git packages are built from the latest source code version so it doesn't matter that "the last update was in May". I've let makepkg bump the pkgver and pushed an update to remove the flag.
If you feel like the package is still out of date, be it due to a broken build due to changed dependencies or not running properly (as long as the game data files have been installed correctly), please flag it again with a more detailed description.
Pinned Comments
luluco250 commented on 2021-10-20 17:44 (UTC) (edited on 2021-10-20 17:44 (UTC) by luluco250)
Upstream seems to have fixed Linux builds, the resulting binary has been renamed to "RSDKv3" so I adjusted the PKGBUILD and launcher accordingly (it'll use the new name for the binary but the launcher remains the same).
The install script will notify about the change if you upgrade from a revision older than 377.