anchor.diff:  , static ? false
   }:
   
  -stdenv.mkDerivation rec {
  +stdenv.mkDerivation (rec {
     name = "zlib-${version}";
     version = "1.2.11";
   
  
positive.code:     # what causes this difference.
    + stdenv.lib.optionalString stdenv.hostPlatform.isDarwin ''
      for file in $out/lib/*.so* $out/lib/*.dylib* ; do
        install_name_tool -id "$file" $file
      done
    ''
      # Non-typical naming confuses libtool which then refuses to use zlib's DLL
  
negative.code:     license = licenses.zlib;
      platforms = platforms.all;
    };
  } // stdenv.lib.optionalAttrs (stdenv.hostPlatform != stdenv.buildPlatform) {
    preConfigure = ''
      export CHOST=${stdenv.hostPlatform.config}
    '';
  })
  