nixpkgs/pkgs/development/libraries/SDL/setup-hook.sh

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addSDLPath () {
if [ -e "$1/include/SDL" ]; then
export SDL_PATH="$SDL_PATH $1/include/SDL"
fi
}
if test -n "$crossConfig"; then
crossEnvHooks+=(addSDLPath)
else
envHooks+=(addSDLPath)
fi