--- /dev/null
+--- 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'