--- ./mesonbuild/backend/backends.py.orig	2021-04-27 01:50:21.000000000 -0500
+++ ./mesonbuild/backend/backends.py	2021-05-11 13:55:37.317838468 -0500
@@ -23,6 +23,7 @@
 import re
 import typing as T
 import hashlib
+import copy
 
 from .. import build
 from .. import dependencies