anchor.diff:      cp -r install/* $out
   
     '';
  -  
  +
     buildCommand = ''
       ${if stdenv.system == "i686-linux" || stdenv.system == "x86_64-linux" then ''
           isoinfo -J -i $src -x /VBoxLinuxAdditions.run > ./VBoxLinuxAdditions.run
           chmod 755 ./VBoxLinuxAdditions.run
  -	./VBoxLinuxAdditions.run --noexec --keep
  +        ./VBoxLinuxAdditions.run --noexec --keep
         ''
         else throw ("Architecture: "+stdenv.system+" not supported for VirtualBox guest additions")
       }
  -    
  +
       # Unpack files
       cd install
       ${if stdenv.system == "i686-linux" then ''
  
positive.code:     cp -v lib/VBoxOGL*.so $out/lib
      mkdir -p $out/lib/dri
      ln -s $out/lib/VBoxOGL.so $out/lib/dri/vboxvideo_dri.so
      
      # Install desktop file
      mkdir -p $out/share/autostart
      cp -v share/VBoxGuestAdditions/vboxclient.desktop $out/share/autostart
  
negative.code:     do
          patchelf --set-rpath $out/lib $i
      done
  
      # Remove references to /usr from various scripts and files
      sed -i -e "s|/usr/bin|$out/bin|" share/VBoxGuestAdditions/vboxclient.desktop
      sed -i -e "s|/usr/bin|$out/bin|" bin/VBoxClient-all
  
      # Install binaries
      mkdir -p $out/sbin
      install -m 755 sbin/VBoxService $out/sbin
  