[3.12] Fix `make htmllive` target (GH-124222)

Allow `make -C Doc htmllive` to work without manual venv activation

Set PATH to ensure that `sphinx-autobuild` can find `sphinx-build`.

(cherry picked from commit 9a6e2336e4b54fc13064b77826a67b03b3b45133)

Authored-by: Zachary Ware <zach@python.org>

diff --git a/Doc/Makefile b/Doc/Makefile
index 4a515d5a92a0b6329a9eb69013c7cb2d85db5b5f..3d39766b3cb08f3ecc0c851747c37c43de48bfc1 100644 (file)
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -152,7 +152,7 @@ htmlview: html
        $(PYTHON) -c "import os, webbrowser; webbrowser.open('file://' + os.path.realpath('build/html/index.html'))"
 
 .PHONY: htmllive
-htmllive: SPHINXBUILD = $(VENVDIR)/bin/sphinx-autobuild
+htmllive: SPHINXBUILD = PATH=$(VENVDIR)/bin:$$PATH sphinx-autobuild
 htmllive: SPHINXOPTS = --re-ignore="/venv/" --open-browser --delay 0
 htmllive: _ensure-sphinx-autobuild html