Struggling to install SDl file on Power Pc emulator

Hello there, I’m trying to install/run an old game on a power pc emulator (sheepshaver). The game (which I found here) requires that I install a sdl file called “SDL-1.2.x.pkg.tar.gz”. When I tried decompressing the file I was given an error message that the file could not be translated. I’m sure I have not given nearly enough information but I don’t really know where to start. If anybody could help that would be awesome

  • Hawk

P.s. I’m not very bright so small words are greatly appreciated