Use LaTeXMk to compile examples and check no warnings were produced

example/mu/Makefile

@@ -24,21 +24,11 @@ all: $(OUTPUT) clean
 
 # This target typesets a pdfLaTeX example.
 %-pdflatex.pdf: %-pdflatex.tex example.bib example-terms-abbrs.tex
-	$(PDFLATEX) $< # The initial typesetting.
-	biber                               $(basename $<).bcf
-	$(PDFLATEX) $< # Update the index after the bibliography insertion.
-	texindy -I latex -C utf8 -L english $(basename $<).idx
-	$(PDFLATEX) $< # The final typesetting, now also with index.
-	$(PDFLATEX) $<
+	latexmk -pdf -Werror $<
 
 # This target typesets a LuaLaTeX example.
 %-lualatex.pdf: %-lualatex.tex example.bib example-terms-abbrs.tex
-	$(LUALATEX) $< # The initial typesetting.
-	biber                               $(basename $<).bcf
-	$(LUALATEX) $< # Update the index after the bibliography insertion.
-	texindy -I latex -C utf8 -L english $(basename $<).idx
-	$(LUALATEX) $< # The final typesetting, now also with index.
-	$(LUALATEX) $<
+	latexmk -lualatex -Werror $<
 
 # This target removes any auxiliary files.
 clean: