anchor.diff:        sha256 = "16acmdr27adma7gs9rs0dxdiqppm15vl3vv3agy7y8s94wyh4ybv";
       });
   
  -  buildInputs = [ curl expat zlib bzip2 libarchive ]
  +  buildInputs = [ curl expat zlib bzip2 ]
       ++ optional useNcurses ncurses
       ++ optional useQt4 qt4;
   
  
positive.code:     (concatMap (p: [ (p.dev or p) (p.out or p) ]) buildInputs);
  
    configureFlags =
      "--docdir=/share/doc/${name} --mandir=/share/man --system-libs"
      + stdenv.lib.optionalString useQt4 " --qt-gui";
  
    setupHook = ./setup-hook.sh;
  
negative.code: { stdenv, fetchurl, fetchpatch, replace, curl, expat, zlib, bzip2
  , useNcurses ? false, ncurses, useQt4 ? false, qt4, wantPS ? false, ps ? null
  }:
  
  