anchor.diff:  
     # determine the version number, there might be different ones per architecture
     version = {
  -    x86_64-linux = "19.3.0.0.0";
  +    x86_64-linux = "19.16.0.0.0";
  +    aarch64-linux = "19.10.0.0.0";
       x86_64-darwin = "19.3.0.0.0";
  +  }.${stdenv.hostPlatform.system} or throwSystem;
  +
  +  directory = {
  +    x86_64-linux = "1916000";
  +    aarch64-linux = "191000";
  +    x86_64-darwin = "193000";
     }.${stdenv.hostPlatform.system} or throwSystem;
   
     # hashes per component and architecture
     hashes = {
       x86_64-linux = {
  -      basic = "1yk4ng3a9ka1mzgfph9br6rwclagbgfvmg6kja11nl5dapxdzaxy";
  -      sdk = "115v1gqr0czy7dcf2idwxhc6ja5b0nind0mf1rn8iawgrw560l99";
  -      sqlplus = "0zj5h84ypv4n4678kfix6jih9yakb277l9hc0819iddc0a5slbi5";
  -      tools = "1q19blr0gz1c8bq0bnv1njzflrp03hf82ngid966xc6gwmqpkdsk";
  -      odbc = "1g1z6pdn76dp440fh49pm8ijfgjazx4cvxdi665fsr62h62xkvch";
  +      basic = "sha256-Sq1rWvbC1YME7EjSYPaP2g+1Xxxkk4ZkGaBmLo2cKcQ=";
  +      sdk = "sha256-yJ8f/Hlq6vZoPxv+dfY4z1E7rWvcqlK+ou0SU0KKlEI=";
  +      sqlplus = "sha256-C44srukpCB9et9UWm59daJmU83zr0HAktnWv7R42Irw=";
  +      tools = "sha256-GP4E1REIoU3lctVYmLsAiwTJEvGRpCmOFlRuZk+A8HE=";
  +      odbc = "sha256-JECxK7Ia1IJtve2goZJdTkvm5NJjqB2rc6k5BXUt3oA=";
  +    };
  +    aarch64-linux = {
  +      basic = "sha256-DNntH20BAmo5kOz7uEgW2NXaNfwdvJ8l8oMnp50BOsY=";
  +      sdk = "sha256-8VpkNyLyFMUfQwbZpSDV/CB95RoXfaMr8w58cRt/syw=";
  +      sqlplus = "sha256-iHcyijHhAvjsAqN9R+Rxo2R47k940VvPbScc2MWYn0Q=";
  +      tools = "sha256-4QY0EwcnctwPm6ZGDZLudOFM4UycLFmRIluKGXVwR0M=";
  +      odbc = "sha256-T+RIIKzZ9xEg/E72pfs5xqHz2WuIWKx/oRfDrQbw3ms=";
       };
       x86_64-darwin = {
         basic = "f4335c1d53e8188a3a8cdfb97494ff87c4d0f481309284cf086dc64080a60abd";
  
positive.code:   # convert platform to oracle architecture names
    arch = {
      x86_64-linux = "linux.x64";
      x86_64-darwin = "macos.x64";
    }.${stdenv.hostPlatform.system} or throwSystem;
  
    shortArch = {
      x86_64-linux = "linux";
      x86_64-darwin = "mac";
    }.${stdenv.hostPlatform.system} or throwSystem;
  
  
negative.code:   srcFilename = component: arch: version: rel:
      "instantclient-${component}-${arch}-${version}" +
      (optionalString (rel != "") "-${rel}") +
      "dbru.zip"; # ¯\_(ツ)_/¯
  
    # fetcher for the non clickthrough artifacts
    fetcher = srcFilename: hash: fetchurl {
      url = "https://download.oracle.com/otn_software/${shortArch}/instantclient/${directory}/${srcFilename}";
      sha256 = hash;
    };
  
  