{ lib, stdenv, fetchurl, fetchFromGitHub }: let # The x86-64-modern may need to be refined further in the future # but stdenv.hostPlatform CPU flags do not currently work on Darwin # https://discourse.nixos.org/t/darwin-system-and-stdenv-hostplatform-features/9745 archDarwin = if stdenv.isx86_64 then "x86-64-modern" else "apple-silicon"; arch = if stdenv.isDarwin then archDarwin else if stdenv.isx86_64 then "x86-64" else if stdenv.isi686 then "x86-32" else if stdenv.isAarch64 then "armv8" else "unknown"; nnueFile = "nn-5af11540bbfe.nnue"; nnue = fetchurl { name = nnueFile; url = "https://tests.stockfishchess.org/api/nn/${nnueFile}"; sha256 = "sha256-WvEVQLv+/LVOOMXdAAyrS0ad+nWZodVb5dJyLCCokps="; }; in stdenv.mkDerivation rec { pname = "stockfish"; version = "16"; src = fetchFromGitHub { owner = "official-stockfish"; repo = "Stockfish"; rev = "sf_${version}"; sha256 = "sha256-ASy2vIP94lnSKgxixK1GoC84yAysaJpxeyuggV4MrP4="; }; # This addresses a linker issue with Darwin # https://github.com/NixOS/nixpkgs/issues/19098 preBuild = lib.optionalString stdenv.isDarwin '' sed -i.orig '/^\#\#\# 3.*Link Time Optimization/,/^\#\#\# 3/d' Makefile ''; postUnpack = '' sourceRoot+=/src echo ${nnue} cp "${nnue}" "$sourceRoot/${nnueFile}" ''; makeFlags = [ "PREFIX=$(out)" "ARCH=${arch}" "CXX=${stdenv.cc.targetPrefix}c++" ]; buildFlags = [ "build" ]; enableParallelBuilding = true; meta = with lib; { homepage = "https://stockfishchess.org/"; description = "Strong open source chess engine"; mainProgram = "stockfish"; longDescription = '' Stockfish is one of the strongest chess engines in the world. It is also much stronger than the best human chess grandmasters. ''; maintainers = with maintainers; [ luispedro siraben ]; platforms = ["x86_64-linux" "i686-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"]; license = licenses.gpl3Only; }; }