--- setupext.py.orig	2019-05-21 09:49:12.000000000 -0400
+++ setupext.py	2019-05-21 09:54:50.000000000 -0400
@@ -958,10 +958,10 @@
 
 class BackendTkAgg(OptionalBackendPackage):
     name = "tkagg"
-    force = True
-
-    def check(self):
-        return "installing; run-time loading from Python Tcl/Tk"
+##    force = True
+##
+##    def check(self):
+##        return "installing; run-time loading from Python Tcl/Tk"
 
     def get_extension(self):
         sources = [