anchor.diff:        boolString (expat != null) "=${expat}" ""}"
       # TODO
       #"--with-dnssec-local-validation"
  -    "--${boolWt (libidn != null)}-libidn"
  +    "--${boolWt (libidn2 != null)}-libidn2"
     ];
   
     meta = with lib; {
  
positive.code: 
  , expat
  , less
  , libidn
  , ncurses
  , openssl_1-0-2
  , readline
  , zlib
  }:
  
negative.code:     "--with-modules"
      #"--with-sysroot"
      "--without-gnutls"
      "--${boolWt (openssl != null)}-openssl${
        boolString (openssl != null) "=${openssl}" ""}"
      "--without-included-regex"
      "--with-libresolv"
      "--${boolWt (readline != null)}-readline${
  