$OpenBSD: patch-doc_Makefile_local,v 1.2 2020/08/13 18:21:18 sthen Exp $

Index: doc/Makefile.local
--- doc/Makefile.local.orig
+++ doc/Makefile.local
@@ -4,7 +4,7 @@ dir := doc
 
 # You can set these variables from the command line.
 SPHINXOPTS    := -q
-SPHINXBUILD   = WITH_EMACS=${WITH_EMACS} RSTI_DIR=$(realpath emacs) sphinx-build
+SPHINXBUILD   = WITH_EMACS=${WITH_EMACS} RSTI_DIR=$(realpath emacs) sphinx-build-3
 DOCBUILDDIR      := $(dir)/_build
 
 # Internal variables.
