anchor.diff:      sha256 = "00mc12k5p1zlrlqcf33vh5zizaqr5ai8q78dwv69smjh6kn4c7j0";
     };
   
  -  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl icu ];
  +  buildInputs = [ makeWrapper gnused db openssl cyrus_sasl icu pcre ]
  +                ++ lib.optional withPgSQL postgresql
  +                ++ lib.optional withMySQL libmysql
  +                ++ lib.optional withSQLite sqlite;
   
     patches = [ ./postfix-script-shell.patch ./postfix-3.0-no-warnings.patch ];
   
  
positive.code:   meta = {
      homepage = "http://www.postfix.org/";
      description = "A fast, easy to administer, and secure mail server";
      license = stdenv.lib.licenses.bsdOriginal;
      platforms = stdenv.lib.platforms.linux;
      maintainers = [ stdenv.lib.maintainers.rickynils ];
    };
  
  }
  
negative.code: { stdenv, lib, fetchurl, makeWrapper, gnused, db, openssl, cyrus_sasl
  , coreutils, findutils, gnugrep, gawk, icu, pcre
  , withPgSQL ? false, postgresql
  , withMySQL ? false, libmysql
  , withSQLite ? false, sqlite
  }:
  
  let
    ccargs = lib.concatStringsSep " " ([
      "-DUSE_TLS" "-DUSE_SASL_AUTH" "-DUSE_CYRUS_SASL" "-I${cyrus_sasl}/include/sasl"
      "-DHAS_DB_BYPASS_MAKEDEFS_CHECK"
      "-fPIE" "-fstack-protector-all" "--param" "ssp-buffer-size=4" "-O2" "-D_FORTIFY_SOURCE=2"
     ] ++ lib.optional withPgSQL "-DHAS_PGSQL"
       ++ lib.optionals withMySQL [ "-DHAS_MYSQL" "-I${libmysql}/include/mysql" ]
       ++ lib.optional withSQLite "-DHAS_SQLITE");
     auxlibs = lib.concatStringsSep " " ([
       "-ldb" "-lnsl" "-lresolv" "-lsasl2" "-lcrypto" "-lssl" "-pie" "-Wl,-z,relro,-z,now"
     ] ++ lib.optional withPgSQL "-lpq"
       ++ lib.optional withMySQL "-lmysqlclient"
       ++ lib.optional withSQLite "-lsqlite3");
  
  in stdenv.mkDerivation rec {
  
    name = "postfix-${version}";
  
  