--- roundup-2.1.0/setup.py	2021-07-03 17:15:51.000000000 +0200
+++ roundup-2.1.0.new/setup.py	2021-11-09 16:39:09.325848304 +0100
@@ -91,7 +91,7 @@
         plp = get_path('platlib')
         # nuke suffix that matches lib/* and return prefix
         head, tail = os.path.split(plp)
-        while tail != 'lib' and head != '':
+        while not tail.startswith("lib") and head != '':
             head, tail = os.path.split(head)
         if not head:
             head = sys.prefix