depot/third_party/nixpkgs/pkgs/development/libraries/xxHash/default.nix

{ lib, stdenv, fetchFromGitHub }:

stdenv.mkDerivation rec {
  pname = "xxHash";
  version = "0.8.1";

  src = fetchFromGitHub {
    owner = "Cyan4973";
    repo = "xxHash";
    rev = "v${version}";
    sha256 = "sha256-2WoYCO6QRHWrbGP2mK04/sLNTyQLOuL3urVktilAwMA=";
  };

  # Upstream Makefile does not anticipate that user may not want to
  # build .so library.
  postPatch = lib.optionalString stdenv.hostPlatform.isStatic ''
    sed -i 's/lib: libxxhash.a libxxhash/lib: libxxhash.a/' Makefile
    sed -i '/LIBXXH) $(DESTDIR/ d' Makefile
  '';

  outputs = [ "out" "dev" ];

  makeFlags = [ "PREFIX=$(dev)" "EXEC_PREFIX=$(out)" ];

  # pkgs/build-support/setup-hooks/compress-man-pages.sh hook fails
  # to compress symlinked manpages. Avoid compressing manpages until
  # it's fixed.
  dontGzipMan = true;

  meta = with lib; {
    description = "Extremely fast hash algorithm";
    longDescription = ''
      xxHash is an Extremely fast Hash algorithm, running at RAM speed limits.
      It successfully completes the SMHasher test suite which evaluates
      collision, dispersion and randomness qualities of hash functions. Code is
      highly portable, and hashes are identical on all platforms (little / big
      endian).
    '';
    homepage = "https://github.com/Cyan4973/xxHash";
    license = with licenses; [ bsd2 gpl2 ];
    maintainers = with maintainers; [ orivej ];
    platforms = platforms.unix;
  };
}