Patch-Source: https://github.com/html5lib/html5lib-python/pull/592#discussion_r2867665876
---
--- a/setup.py
+++ b/setup.py
@@ -6,9 +6,11 @@ import sys
 
 from os.path import join, dirname
 from setuptools import setup, find_packages, __version__ as setuptools_version
-from pkg_resources import parse_version
 
-import pkg_resources
+try:
+    import pkg_resources
+except ImportError:
+    pkg_resources = None
 
 try:
     import _markerlib.markers