Add forgotten import

command/install.py

@@ -10,6 +10,7 @@ import sys, os, string
 from types import *
 from distutils.core import Command, DEBUG
 from distutils.sysconfig import get_config_vars
+from distutils.errors import DistutilsPlatformError
 from distutils.file_util import write_file
 from distutils.util import convert_path, subst_vars, change_root
 from distutils.errors import DistutilsOptionError