code: def fix_lib64(lib_dir, symlink=True):
      
      # PyPy's library path scheme is not affected by this.
      # Return early or we will die on the following assert.
      if is_pypy:
          logger.debug('PyPy detected, skipping lib64 symlinking')
          return
      # Check we have a lib64 library path
      if not [p for p in distutils.sysconfig.get_config_vars().values()
              if isinstance(p, basestring) and 'lib64' in p]:
          return
  
      logger.debug('This system uses lib64; symlinking lib64 to lib')
  
      assert os.path.basename(lib_dir) == 'python%s' % sys.version[:3], (
          "Unexpected python lib dir: %r" % lib_dir)
      lib_parent = os.path.dirname(lib_dir)
      top_level = os.path.dirname(lib_parent)
      lib_dir = os.path.join(top_level, 'lib')
      lib64_link = os.path.join(top_level, 'lib64')
      assert os.path.basename(lib_parent) == 'lib', (
          "Unexpected parent dir: %r" % lib_parent)
      if os.path.lexists(lib64_link):
          return
      if symlink:
          os.symlink('lib', lib64_link)
      else:
          copyfile('lib', lib64_link)
docs: Some platforms (particularly Gentoo on x64) put things in lib64/pythonX.Y
      instead of lib/pythonX.Y.  If this is such a platform we'll just create a
      symlink so lib64 points to lib