anchor.diff: -{ stdenv, fetchFromGitHub, pkgconfig, nettools, gettext, libtool
  +{ stdenv, fetchFromGitHub, pkgconfig, nettools, gettext, libtool, flex
   , readline ? null, openssl ? null, python ? null, ncurses ? null
   , sqlite ? null, postgresql ? null, libmysql ? null, zlib ? null, lzo ? null
   , acl ? null, glusterfs ? null, libceph ? null, libcap ? null
  
positive.code:     "sysconfdir=\${out}/etc"
      "working_dir=\${TMPDIR}"
      "log_dir=\${TMPDIR}"
    ];
  
    meta = with stdenv.lib; {
  
negative.code:   };
  
    buildInputs = [
      pkgconfig nettools gettext readline openssl python flex
      ncurses sqlite postgresql libmysql zlib lzo acl glusterfs libceph libcap
    ];
  
  