anchor.diff: -{ lib, stdenv, fetchurl, jre, makeWrapper
  -, mysqlSupport ? true, mysql_jdbc
  -, postgresqlSupport ? true, postgresql_jdbc }:
  +{ lib
  +, stdenv
  +, fetchurl
  +, jre
  +, makeWrapper
  +, mysqlSupport ? true
  +, mysql_jdbc
  +, postgresqlSupport ? true
  +, postgresql_jdbc
  +, redshiftSupport ? true
  +, redshift_jdbc
  +, liquibase_redshift_extension
  +}:
   
   let
     extraJars =
       lib.optional mysqlSupport mysql_jdbc
  -    ++ lib.optional postgresqlSupport postgresql_jdbc;
  +    ++ lib.optional postgresqlSupport postgresql_jdbc
  +    ++ lib.optionals redshiftSupport [
  +      redshift_jdbc
  +      liquibase_redshift_extension
  +    ];
   in
   
   stdenv.mkDerivation rec {
  
positive.code:         liquibase.integration.commandline.Main \''${1+"\$@"}
        EOF
        chmod +x $out/bin/liquibase
    '';
  
    meta = with lib; {
      description = "Version Control for your database";
  
negative.code:         CP="\$CP":"\$jar"
        done
      '';
      in
      ''
        mkdir -p $out
        mv ./{lib,licenses,liquibase.jar} $out/
  
  