diff -Naur certbot-0.30.0.orig/docs/Makefile certbot-0.30.0/docs/Makefile
--- certbot-0.30.0.orig/docs/Makefile	2019-01-02 21:33:19.000000000 +0100
+++ certbot-0.30.0/docs/Makefile	2019-01-07 13:06:55.441559203 +0100
@@ -3,7 +3,7 @@
 
 # You can set these variables from the command line.
 SPHINXOPTS    =
-SPHINXBUILD   = sphinx-build
+SPHINXBUILD   = sphinx-build-3
 PAPER         =
 BUILDDIR      = _build