anchor.diff:    patches = [
       # patch to fix python-test
       ./darwin.patch
  -  ] ++ stdenv.lib.optionals (!enableShared) [
  +  ] ++ lib.optionals (!enableShared) [
       # The shared jemalloc lib is unused and breaks in static mode due to missing -fpic.
       ./jemalloc-disable-shared.patch
     ];
  
positive.code:     # Disable Python for static mode because openblas is currently broken there.
      "-DARROW_PYTHON=${if enableShared then "ON" else "OFF"}"
      "-Duriparser_SOURCE=SYSTEM"
    ] ++ stdenv.lib.optionals (!enableShared) [
      "-DARROW_BUILD_SHARED=OFF"
      "-DARROW_TEST_LINKAGE=static"
      "-DOPENSSL_USE_STATIC_LIBS=ON"
    ] ++ stdenv.lib.optional (!stdenv.isx86_64) "-DARROW_USE_SIMD=OFF";
  
    doInstallCheck = true;
    PARQUET_TEST_DATA =
      if doInstallCheck then "${parquet-testing}/data" else null;
    installCheckInputs = [ perl which ];
    installCheckPhase = (stdenv.lib.optionalString stdenv.isDarwin ''
      for f in release/*test{,s}; do
        install_name_tool -add_rpath "$out"/lib  "$f"
      done
    '')
    + (let
      excludedTests = stdenv.lib.optionals stdenv.isDarwin [
        # Some plasma tests need to be patched to use a shorter AF_UNIX socket
        # path on Darwin. See https://github.com/NixOS/nix/pull/1085
        "plasma-external-store-tests"
  
negative.code:   meta = {
      description = "A  cross-language development platform for in-memory data";
      homepage = "https://arrow.apache.org/";
      license = lib.licenses.asl20;
      platforms = lib.platforms.unix;
      maintainers = with lib.maintainers; [ tobim veprbl ];
    };
  }
  