{ stdenv, fetchurl }: let arch = if stdenv.isx86_64 then "x86-64" else if stdenv.isi686 then "x86-32" else "unknown"; version = "12"; nnueFile = "nn-82215d0fd0df.nnue"; nnue = fetchurl { name = nnueFile; url = "https://tests.stockfishchess.org/api/nn/${nnueFile}"; sha256 = "1r4yqrh4di05syyhl84hqcz84djpbd605b27zhbxwg6zs07ms8c2"; }; in stdenv.mkDerivation { pname = "stockfish"; inherit version; src = fetchurl { url = "https://github.com/official-stockfish/Stockfish/archive/sf_${version}.tar.gz"; sha256 = "16980aicm5i6i9252239q4f9bcxg1gnqkv6nphrmpz4drg8i3v6i"; }; postUnpack = '' sourceRoot+=/src echo ${nnue} cp "${nnue}" "$sourceRoot/${nnueFile}" ''; makeFlags = [ "PREFIX=$(out)" "ARCH=${arch}" ]; buildFlags = [ "build" ]; enableParallelBuilding = true; meta = with stdenv.lib; { homepage = "https://stockfishchess.org/"; description = "Strong open source chess engine"; 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 peti ]; platforms = ["x86_64-linux" "i686-linux"]; license = licenses.gpl2; }; }