From: Michael R. Crusoe <crusoe@debian.org>
Subject: Makefile must have tabs, not spaces
Forwarded: https://github.com/psf/black/pull/5004
--- black.orig/docs/Makefile
+++ black/docs/Makefile
@@ -10,11 +10,11 @@
 
 # Put it first so that "make" without argument is like "make help".
 help:
-    @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
 .PHONY: help Makefile
 
 # Catch-all target: route all unknown targets to Sphinx using the new
 # "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS).
 %: Makefile
-    @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
