--- Cython-0.29.21/docs/conf.py.orig	2020-05-19 10:45:14.000000000 +0200
+++ Cython-0.29.21/docs/conf.py	2020-12-12 17:15:58.359720178 +0100
@@ -41,7 +41,7 @@
 extensions = [
     'ipython_console_highlighting',
     'cython_highlighting',
-    'sphinx.ext.pngmath',
+    'sphinx.ext.imgmath',
     'sphinx.ext.todo',
     'sphinx.ext.intersphinx',
     'sphinx.ext.autodoc'