Add spelling version

docs/Makefile

@@ -3,14 +3,17 @@
 
 # You can set these variables from the command line, and also
 # from the environment for the first two.
-SPHINXOPTS    ?=
-SPHINXBUILD   ?= sphinx-build
+ALLSPHINXOPTS=-d %BUILDDIR%/doctrees %SPHINXOPTS% source
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
 SOURCEDIR     = source
 BUILDDIR      = build
 
+
 # Put it first so that "make" without argument is like "make help".
 help:
 	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+	@echo "  spelling  to check for typos in documentation"
 
 .PHONY: help Makefile
 
@@ -19,6 +22,10 @@ help:
 %: Makefile
 	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
 
+
 spelling:
-	$(SPHINXBUILD) -b spelling -W $(ALLSPHINXOPTS) $(BUILDDIR)/spelling
-#	$(SPHINXBUILD) -b spelling 'docs/source' 'docs/build'
+	$(SPHINXBUILD) -b spelling -W $(SOURCEDIR) $(BUILDDIR)/spelling
+	@echo
+	@echo "Check finished. Wrong words can be found in " \
+                "build/spelling/output.txt."
+