diff --git a/make-includes/build_lecture_rules.make b/make-includes/build_lecture_rules.make
index 0911f64..5d3703e 100644
--- a/make-includes/build_lecture_rules.make
+++ b/make-includes/build_lecture_rules.make
@@ -84,6 +84,17 @@
 
 ################################################################################
 #
+# Alternate LaTeXs for Unicode vs. non-Unicode provessing.
+#
+ifdef UNICODE
+LATEXCMD:=$(XELATEX)
+else
+LATEXCMD:=$(PDFLATEX)
+endif
+
+
+################################################################################
+#
 # Build everything.
 #
 all: slides notes figures figures2up combined
@@ -112,8 +123,8 @@
 slides: $(SLIDES_PREREQS)
 
 $(SLIDES).pdf: $(SLIDES).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS) $(SLIDE_FILES)
-	$(PDFLATEX) --jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES)}'
-	$(PDFLATEX) --jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=$(SLIDES) '\documentclass[$(LATEX_OPTS)]{lectureslides}\input{$(SLIDES)}'
 
 else
 
@@ -136,8 +147,8 @@
 slides-notes: slides-notes.pdf
 
 slides-notes.pdf: $(SLIDES).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS) $(SLIDE_FILES)
-	$(PDFLATEX) --jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES)}'
-	$(PDFLATEX) --jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=slides-notes '\documentclass[$(LATEX_OPTS),notes=onlyslideswithnotes]{lectureslides}\input{$(SLIDES)}'
 
 #
 # Build the slides with notes, 6-up.
@@ -145,8 +156,8 @@
 notes: $(NOTES).pdf
 
 $(NOTES).pdf: $(NOTES).tex slides-notes.pdf
-	$(PDFLATEX) $<
-	$(PDFLATEX) $<
+	$(LATEXCMD) $<
+	$(LATEXCMD) $<
 
 else
 
@@ -180,8 +191,8 @@
 slides-combined: slides-combined.pdf
 
 slides-combined.pdf: $(SLIDES).tex $(SLIDE_IMAGES) $(SLIDE_BACKGROUNDS)
-	$(PDFLATEX) --jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES)}'
-	$(PDFLATEX) --jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES)}'
+	$(LATEXCMD) --jobname=slides-combined '\documentclass[$(LATEX_OPTS),handout]{lectureslides}\input{$(SLIDES)}'
 
 #
 # Build the complete combined document.
@@ -189,8 +200,8 @@
 combined: $(COMBINED).pdf
 
 $(COMBINED).pdf: $(COMBINED_PREREQS) $(COMBI_IMAGES) $(COMBI_FILES)
-	$(PDFLATEX) $<
-	$(PDFLATEX) $<
+	$(LATEXCMD) $<
+	$(LATEXCMD) $<
 
 else
 
@@ -210,8 +221,8 @@
 figures: $(FIGURES).pdf
 
 $(FIGURES).pdf: $(FIGURES).tex $(FIG_IMAGES) $(FIG_FILES)
-	$(PDFLATEX) $<
-	$(PDFLATEX) $<
+	$(LATEXCMD) $<
+	$(LATEXCMD) $<
 
 figures2up: $(FIGURES)-reduced.pdf
 
@@ -291,6 +302,7 @@
 	@$(ECHO) "FIG_FILES = [$(FIG_FILES)]"
 	@$(ECHO) "TIDY_FILES = [$(TIDY_FILES)]"
 	@$(ECHO) "CLEAN_FILES = [$(CLEAN_FILES)]"
+	@$(ECHO) "LATEXCMD = [$(LATEXCMD)]"
 	@$(ECHO) "DRAFT = [$(DRAFT)]"
 	@$(ECHO) "LATEX_OPTS = [$(LATEX_OPTS)]"
 	@$(ECHO) "SLIDES = [$(SLIDES)]"