anchor.diff:        interpreter = "${self}/bin/${executable}";
       };
   
  -    enableParallelBuilding = true;
  +    enableParallelBuilding = true;  # almost no parallelization without STM
   
       meta = with stdenv.lib; {
         homepage = http://pypy.org/;
  -      description = "Fast, compliant alternative implementation of the Python language (2.7.3)";
  +      description = "Fast, compliant alternative implementation of the Python language (2.7.8)";
         license = licenses.mit;
         platforms = platforms.linux;
         maintainers = with maintainers; [ iElectric ];
  
positive.code:        mkdir -p $out/{bin,include,lib,pypy-c}
  
         cp -R {include,lib_pypy,lib-python,pypy-c} $out/pypy-c
         ln -s $out/pypy-c/pypy-c $out/bin/pypy
         chmod +x $out/bin/pypy
  
  
negative.code:        ln -s $out/pypy-c/include $out/include/${libPrefix}
         ln -s $out/pypy-c/lib-python/${pythonVersion} $out/lib/${libPrefix}
  
         wrapProgram "$out/bin/pypy" \
           --set LD_LIBRARY_PATH "${LD_LIBRARY_PATH}:$out/lib" \
           --set LIBRARY_PATH "${LIBRARY_PATH}:$out/lib"
  
         # verify cffi modules
         $out/bin/pypy -c "import Tkinter;import sqlite3;import curses"
      '';
  
      passthru = rec {
  