This is the version number for sdl-ttf... it has nothing to so with the base sdl package's version number. If you look at the versioning scheme for the source tarballs it become apparent https://www.libsdl.org/projects/SDL_ttf/release/
As far as dev packages go, there is libsdl-ttf2.0-dev which corresponds to libsdl-ttf2.0-0
This is the version number for sdl-ttf... it has nothing to so with the base sdl package's version number. If you look at the versioning scheme for the source tarballs it become apparent https:/ /www.libsdl. org/projects/ SDL_ttf/ release/
As far as dev packages go, there is libsdl-ttf2.0-dev which corresponds to libsdl-ttf2.0-0