diff --git a/make-includes/standard_rules.make b/make-includes/standard_rules.make
index 102823b..1aacc17 100755
--- a/make-includes/standard_rules.make
+++ b/make-includes/standard_rules.make
@@ -38,8 +38,13 @@
 # PDF from LaTeX.
 #
 %.pdf: %.tex
+ifdef UNICODE
+	$(XELATEX) $<
+	$(XELATEX) $<
+else
 	$(PDFLATEX) $<
 	$(PDFLATEX) $<
+endif
 #
 # 2-up PDF from 1-up PDF.
 #
@@ -68,12 +73,20 @@
 # LaTeX from derived XML.
 #
 %.tex: %-derived.xml
+ifdef UNICODE
+	$(call xslt,$<,xml2xelatex.xsl,$(call xslt_parameter,subject-code,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper-number,'$(PAPER_NUMBER)'),$(call xslt_parameter,paper-year,'$(PAPER_YEAR)'),$(call xslt_parameter,paper-period,'$(PAPER_PERIOD)')) > $@
+else
 	$(call xslt,$<,xml2latex.xsl,$(call xslt_parameter,subject-code,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper-number,'$(PAPER_NUMBER)'),$(call xslt_parameter,paper-year,'$(PAPER_YEAR)'),$(call xslt_parameter,paper-period,'$(PAPER_PERIOD)')) > $@
+endif
 #
 # HTML from derived XML.
 #
 %.html: %-derived.xml
+ifdef UNICODE
+	$(call xslt,$<,xml2xhtml.xsl,$(call xslt_parameter,subject-code,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper-number,'$(PAPER_NUMBER)'),$(call xslt_parameter,paper-year,'$(PAPER_YEAR)'),$(call xslt_parameter,paper-period,'$(PAPER_PERIOD)')) > $@
+else
 	$(call xslt,$<,xml2html.xsl,$(call xslt_parameter,subject-code,'$(SUBJECT_CODE)'),$(call xslt_parameter,paper-number,'$(PAPER_NUMBER)'),$(call xslt_parameter,paper-year,'$(PAPER_YEAR)'),$(call xslt_parameter,paper-period,'$(PAPER_PERIOD)')) > $@
+endif
 #
 # PNG from TIFF (normal)
 #