anchor.diff:      ++ lib.optional withPgSQL "--with-pgsql"
       ++ lib.optional withSQLite "--with-sqlite";
   
  +  doCheck = !stdenv.isDarwin;
  +
     meta = with lib; {
       homepage = "https://dovecot.org/";
       description = "Open source IMAP and POP3 email server written with security primarily in mind";
  
positive.code: { stdenv, lib, fetchurl, perl, pkg-config, systemd, openssl
  , bzip2, zlib, lz4, inotify-tools, pam, libcap
  , clucene_core_2, icu, openldap, libsodium, libstemmer, cyrus_sasl
  , nixosTests
  # Auth modules
  
negative.code: 
    enableParallelBuilding = true;
  
    postPatch = ''
      sed -i -E \
        -e 's!/bin/sh\b!${stdenv.shell}!g' \
        -e 's!([^[:alnum:]/_-])/bin/([[:alnum:]]+)\b!\1${coreutils}/bin/\2!g' \
        -e 's!([^[:alnum:]/_-])(head|sleep|cat)\b!\1${coreutils}/bin/\2!g' \
        src/lib-program-client/test-program-client-local.c
  
      patchShebangs src/lib-smtp/test-bin/*.sh
      sed -i -s -E 's!\bcat\b!${coreutils}/bin/cat!g' src/lib-smtp/test-bin/*.sh
  
      patchShebangs src/config/settings-get.pl
    '' + lib.optionalString stdenv.isLinux ''
      export systemdsystemunitdir=$out/etc/systemd/system
    '';
  
    # We need this for sysconfdir, see remark below.
    installFlags = [ "DESTDIR=$(out)" ];
  