anchor.diff:  { lib, stdenv, fetchurl, flex, bison, autoconf
   , mysql, libxml2, readline, zlib, curl, postgresql, gettext
   , openssl, pcre, pcre2, pkgconfig, sqlite, config, libjpeg, libpng, freetype
  -, libxslt, libmcrypt, bzip2, icu, openldap, cyrus_sasl, libmhash, freetds
  +, libxslt, libmcrypt, bzip2, icu, openldap, cyrus_sasl, libmhash
   , uwimap, pam, gmp, apacheHttpd, libiconv, systemd, libsodium, html-tidy, libargon2, libzip
   }:
   
  
positive.code:         ++ optional xslSupport libxslt
          ++ optional mcryptSupport libmcrypt'
          ++ optional bz2Support bzip2
          ++ optional (mssqlSupport && !stdenv.isDarwin) freetds
          ++ optional sodiumSupport libsodium
          ++ optional tidySupport html-tidy
          ++ optional argon2Support libargon2
  
negative.code:       ++ optional zipSupport "--enable-zip"
        ++ optional ftpSupport "--enable-ftp"
        ++ optional fpmSupport "--enable-fpm"
        ++ optional ztsSupport "--enable-maintainer-zts"
        ++ optional calendarSupport "--enable-calendar"
        ++ optional sodiumSupport "--with-sodium=${libsodium.dev}"
  