anchor.diff:        with C-style syntax. It offers compilation to JavaScript, interfaces,
         mixins, abstract classes, reified generics, and optional typing.
       '';
  -    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" ];
  +    platforms = [ "x86_64-linux" "i686-linux" "aarch64-linux" "x86_64-darwin" ];
       license = licenses.bsd3;
     };
   }
  
positive.code:     "1.24.3-aarch64-linux" = fetchurl {
        url = "${base}/${stable_version}/release/${version}/sdk/dartsdk-linux-${aarch64}-release.zip";
        sha256 = "1p5bn04gr91chcszgmw5ng8mlzgwsrdr2v7k7ppwr1slkx97fsrh";
      };
      "2.7.2-x86_64-linux" = fetchurl {
        url = "${base}/${stable_version}/release/${version}/sdk/dartsdk-linux-${x86_64}-release.zip";
  
negative.code:     aarch64 = "arm64";
  
    in {
      "1.24.3-x86_64-darwin" = fetchurl {
        url = "${base}/${stable_version}/release/${version}/sdk/dartsdk-macos-${x86_64}-release.zip";
        sha256 = "1n4cq4jrms4j0yl54b3w14agcgy8dbipv5788jziwk8q06a8c69l";
      };
      "1.24.3-x86_64-linux" = fetchurl {
        url = "${base}/${stable_version}/release/${version}/sdk/dartsdk-linux-${x86_64}-release.zip";
        sha256 = "16sm02wbkj328ni0z1z4n4msi12lb8ijxzmbbfamvg766mycj8z3";
  