--- setup.cfg.orig	2019-05-19 09:28:28.000000000 -0700
+++ setup.cfg	2019-05-19 09:28:46.000000000 -0700
@@ -57,7 +57,7 @@
 	setuptools_scm>=1.15.0
 	setuptools_scm_git_archive>=1.0
 install_requires = 
-	backports.functools_lru_cache
+	backports.functools_lru_cache;python_version=="2.7"
 	six>=1.11.0
 	more_itertools>=2.6