--- a/setup.py	Sun Jan 24 18:24:11 2021 -0800
+++ b/setup.py	Sun Jan 24 19:08:47 2021 -0500
@@ -1694,6 +1694,8 @@
     'mercurial.pure',
 ]
 
+py2exe_includes = []
+
 py2exeexcludes = []
 py2exedllexcludes = ['crypt32.dll']
 
@@ -1722,6 +1724,10 @@
     if extrapackages:
         py2exepackages.extend(extrapackages.split(' '))
 
+    extra_includes = os.environ.get('HG_PY2EXE_EXTRA_INCLUDES')
+    if extra_includes:
+        py2exe_includes.extend(extra_includes.split(' '))
+
     excludes = os.environ.get('HG_PY2EXE_EXTRA_EXCLUDES')
     if excludes:
         py2exeexcludes.extend(excludes.split(' '))
@@ -1821,6 +1827,7 @@
         'py2exe': {
             'bundle_files': 3,
             'dll_excludes': py2exedllexcludes,
+            'includes': py2exe_includes,
             'excludes': py2exeexcludes,
             'packages': py2exepackages,
         },