macOS: add sdl3 dependency (Homebrew sdl2 is sdl2-compat)#284
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Modern Homebrew's "sdl2" formula is sdl2-compat, a shim that dlopen()s the real SDL3 at runtime, so SDL3 must be present for the built app to run on macOS. Add sdl3 to the Brewfile and the macOS dependency list in the build docs.
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Problem
On a current Homebrew, the
sdl2formula is sdl2-compat — a compatibility shim that doesn't contain SDL itself butdlopens the real SDL3 at runtime. So a macOS build that only installssdl2links/builds fine but the resulting app needslibSDL3.dylibpresent to run.Fix
Add
sdl3to theBrewfileand to the macOS dependency list indocs/BUILDING.md, so a fresh macOS build has SDL3 available at runtime.Two-line change; no build-system changes.