anchor.diff:  
     preConfigure = ''
       patchShebangs scripts/.
  -    sed -i 's;/usr;;g' INSTALL.im
  -    substituteInPlace build --replace /usr/bin/icmake ${icmake}/bin/icmake
  +    substituteInPlace INSTALL.im --replace /usr $out
  +    patchShebangs ./build
       substituteInPlace macros/rawmacros/startdoc.pl --replace /usr/bin/perl ${perl}/bin/perl
  +    substituteInPlace scripts/yodl2whatever.in --replace getopt ${utillinux}/bin/getopt
     '';
   
     buildPhase = ''
  
positive.code:   '';
  
    installPhase = ''
      ./build install programs $out
      ./build install macros $out
      ./build install man $out
    '';
  
    meta = with stdenv.lib; {
  
negative.code: { stdenv, fetchurl, perl, icmake, utillinux }:
  
  stdenv.mkDerivation rec {
    name = "yodl-${version}";
  