anchor.diff:    makeFlags = [
       "SHELL_PATH=${stdenv.shell}"
       "SANE_TOOL_PATH=${stdenv.lib.concatStringsSep ":" path}"
  -    "USE_LIBPCRE=1"
  +    "USE_LIBPCRE2=1"
       "GNU_ROFF=1"
       "PERL_PATH=${perl}/bin/perl"
       "PYTHON_PATH=${python}/bin/python"
  
positive.code: , gnugrep
  , gnused
  , openssl
  , pcre
  , perl
  , python
  , zlib
  
negative.code:     curl
      expat
      openssl
      pcre2
      zlib
    ];
  
  