Further ensuring dependencies are installed

Makefile

@@ -9,8 +9,10 @@ clean:
 
 .PHONY: coverage
 coverage:
+	python3 -c "import pytest" > /dev/null 2>&1 || python3 -m pip install pytest
 	python3 -m pytest -qq
 	rm -r htmlcov || true
+	python3 -c "import coverage" > /dev/null 2>&1 || python3 -m pip install coverage
 	python3 -m coverage report
 
 .PHONY: doc
@@ -86,30 +88,30 @@ sdist:
 
 .PHONY: test
 test:
-	python3 -c "import pytest" || python3 -m pip install pytest
+	python3 -c "import pytest" > /dev/null 2>&1 || python3 -m pip install pytest
 	python3 -m pytest -qq
 
 .PHONY: valgrind
 valgrind:
-	python3 -c "import pytest_valgrind" || python3 -m pip install pytest-valgrind
+	python3 -c "import pytest_valgrind" > /dev/null 2>&1 || python3 -m pip install pytest-valgrind
 	PYTHONMALLOC=malloc valgrind --suppressions=Tests/oss-fuzz/python.supp --leak-check=no \
             --log-file=/tmp/valgrind-output \
             python3 -m pytest --no-memcheck -vv --valgrind --valgrind-log=/tmp/valgrind-output
 
 .PHONY: readme
 readme:
-	python3 -c "import markdown2" || python3 -m pip install markdown2
+	python3 -c "import markdown2" > /dev/null 2>&1 || python3 -m pip install markdown2
 	python3 -m markdown2 README.md > .long-description.html && open .long-description.html
 
 
 .PHONY: lint
 lint:
-	python3 -c "import tox" || python3 -m pip install tox
+	python3 -c "import tox" > /dev/null 2>&1 || python3 -m pip install tox
 	python3 -m tox -e lint
 
 .PHONY: lint-fix
 lint-fix:
-	python3 -c "import black" || python3 -m pip install black
-	python3 -c "import isort" || python3 -m pip install isort
+	python3 -c "import black" > /dev/null 2>&1 || python3 -m pip install black
+	python3 -c "import isort" > /dev/null 2>&1 || python3 -m pip install isort
 	python3 -m black --target-version py37 .
 	python3 -m isort .

docs/Makefile

@@ -41,38 +41,48 @@ help:
 clean:
 	-rm -rf $(BUILDDIR)/*
 
+install-sphinx:
+	python3 -c "import sphinx" > /dev/null 2>&1 || python3 -m pip install sphinx
+
 html:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b html -W --keep-going $(ALLSPHINXOPTS) $(BUILDDIR)/html
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/html."
 
 dirhtml:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b dirhtml $(ALLSPHINXOPTS) $(BUILDDIR)/dirhtml
 	@echo
 	@echo "Build finished. The HTML pages are in $(BUILDDIR)/dirhtml."
 
 singlehtml:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b singlehtml $(ALLSPHINXOPTS) $(BUILDDIR)/singlehtml
 	@echo
 	@echo "Build finished. The HTML page is in $(BUILDDIR)/singlehtml."
 
 pickle:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b pickle $(ALLSPHINXOPTS) $(BUILDDIR)/pickle
 	@echo
 	@echo "Build finished; now you can process the pickle files."
 
 json:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b json $(ALLSPHINXOPTS) $(BUILDDIR)/json
 	@echo
 	@echo "Build finished; now you can process the JSON files."
 
 htmlhelp:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b htmlhelp $(ALLSPHINXOPTS) $(BUILDDIR)/htmlhelp
 	@echo
 	@echo "Build finished; now you can run HTML Help Workshop with the" \
 	      ".hhp project file in $(BUILDDIR)/htmlhelp."
 
 qthelp:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b qthelp $(ALLSPHINXOPTS) $(BUILDDIR)/qthelp
 	@echo
 	@echo "Build finished; now you can run "qcollectiongenerator" with the" \
@@ -82,6 +92,7 @@ qthelp:
 	@echo "# assistant -collectionFile $(BUILDDIR)/qthelp/PillowPILfork.qhc"
 
 devhelp:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b devhelp $(ALLSPHINXOPTS) $(BUILDDIR)/devhelp
 	@echo
 	@echo "Build finished."
@@ -91,11 +102,13 @@ devhelp:
 	@echo "# devhelp"
 
 epub:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b epub $(ALLSPHINXOPTS) $(BUILDDIR)/epub
 	@echo
 	@echo "Build finished. The epub file is in $(BUILDDIR)/epub."
 
 latex:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo
 	@echo "Build finished; the LaTeX files are in $(BUILDDIR)/latex."
@@ -103,22 +116,26 @@ latex:
 	      "(use \`make latexpdf' here to do that automatically)."
 
 latexpdf:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b latex $(ALLSPHINXOPTS) $(BUILDDIR)/latex
 	@echo "Running LaTeX files through pdflatex..."
 	$(MAKE) -C $(BUILDDIR)/latex all-pdf
 	@echo "pdflatex finished; the PDF files are in $(BUILDDIR)/latex."
 
 text:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b text $(ALLSPHINXOPTS) $(BUILDDIR)/text
 	@echo
 	@echo "Build finished. The text files are in $(BUILDDIR)/text."
 
 man:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b man $(ALLSPHINXOPTS) $(BUILDDIR)/man
 	@echo
 	@echo "Build finished. The manual pages are in $(BUILDDIR)/man."
 
 texinfo:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
 	@echo
 	@echo "Build finished. The Texinfo files are in $(BUILDDIR)/texinfo."
@@ -126,28 +143,33 @@ texinfo:
 	      "(use \`make info' here to do that automatically)."
 
 info:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b texinfo $(ALLSPHINXOPTS) $(BUILDDIR)/texinfo
 	@echo "Running Texinfo files through makeinfo..."
 	make -C $(BUILDDIR)/texinfo info
 	@echo "makeinfo finished; the Info files are in $(BUILDDIR)/texinfo."
 
 gettext:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b gettext $(I18NSPHINXOPTS) $(BUILDDIR)/locale
 	@echo
 	@echo "Build finished. The message catalogs are in $(BUILDDIR)/locale."
 
 changes:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b changes $(ALLSPHINXOPTS) $(BUILDDIR)/changes
 	@echo
 	@echo "The overview file is in $(BUILDDIR)/changes."
 
 linkcheck:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b linkcheck $(ALLSPHINXOPTS) $(BUILDDIR)/linkcheck -j auto
 	@echo
 	@echo "Link check complete; look for any errors in the above output " \
 	      "or in $(BUILDDIR)/linkcheck/output.txt."
 
 doctest:
+	$(MAKE) install-sphinx
 	$(SPHINXBUILD) -b doctest $(ALLSPHINXOPTS) $(BUILDDIR)/doctest
 	@echo "Testing of doctests in the sources finished, look at the " \
 	      "results in $(BUILDDIR)/doctest/output.txt."