Instead of relative imports, use (implicitly) absolute ones.
diff --git a/Lib/distutils/sysconfig.py b/Lib/distutils/sysconfig.py
index dc603be..0feb14a 100644
--- a/Lib/distutils/sysconfig.py
+++ b/Lib/distutils/sysconfig.py
@@ -16,7 +16,7 @@
 import string
 import sys
 
-from .errors import DistutilsPlatformError
+from distutils.errors import DistutilsPlatformError
 
 # These are needed in a couple of spots, so just compute them once.
 PREFIX = os.path.normpath(sys.prefix)