In the following unit, line 3901, SDL_CreateThread(... is wrong. .../fpcsrc/packages/sdl/src/sdl.pas I fixed it like this and it works: Old: ``` // function SDL_CreateThread(fn: PInt; data: Pointer): PSDL_Thread; ``` New: ``` function SDL_CreateThread(fn: Pointer; data: Pointer): PSDL_Thread; ``` Tested with a 64-bit Linux Source: https://gitlab.com/freepascal.org/fpc/source/-/blob/main/packages/sdl/src/sdl.pas