anchor.diff:        basic = "1yk4ng3a9ka1mzgfph9br6rwclagbgfvmg6kja11nl5dapxdzaxy";
         sdk = "115v1gqr0czy7dcf2idwxhc6ja5b0nind0mf1rn8iawgrw560l99";
         sqlplus = "0zj5h84ypv4n4678kfix6jih9yakb277l9hc0819iddc0a5slbi5";
  +      tools = "1q19blr0gz1c8bq0bnv1njzflrp03hf82ngid966xc6gwmqpkdsk";
         odbc = "1g1z6pdn76dp440fh49pm8ijfgjazx4cvxdi665fsr62h62xkvch";
       };
       x86_64-darwin = {
         basic = "f4335c1d53e8188a3a8cdfb97494ff87c4d0f481309284cf086dc64080a60abd";
         sdk = "b46b4b87af593f7cfe447cfb903d1ae5073cec34049143ad8cdc9f3e78b23b27";
         sqlplus = "f7565c3cbf898b0a7953fbb0017c5edd9d11d1863781588b7caf3a69937a2e9e";
  +      tools = "b2bc474f98da13efdbc77fd05f559498cd8c08582c5b9038f6a862215de33f2c";
         odbc = "f91da40684abaa866aa059eb26b1322f2d527670a1937d678404c991eadeb725";
       };
     }.${stdenv.hostPlatform.system} or throwSystem;
  
positive.code:   throwSystem = throw "Unsupported system: ${stdenv.hostPlatform.system}";
  
    # assemble list of components
    components = [ "basic" "sdk" "sqlplus" ] ++ optional odbcSupport "odbc";
  
    # determine the version number, there might be different ones per architecture
    version = {
  
negative.code: 
    installPhase = ''
      mkdir -p "$out/"{bin,include,lib,"share/java","share/${pname}-${version}/demo/"} $lib/lib
      install -Dm755 {adrci,genezi,uidrvci,sqlplus,exp,expdp,imp,impdp} $out/bin
  
      # cp to preserve symlinks
      cp -P *${extLib}* $lib/lib
  