diff --git a/make-includes/standard_environment.make b/make-includes/standard_environment.make
index 2315364..84581a4 100644
--- a/make-includes/standard_environment.make
+++ b/make-includes/standard_environment.make
@@ -10,19 +10,31 @@
 #
 # Various environment variables.
 #
-# Set DRAFT to anything to run in draft mode (e.g., make DRAFT=draft xxx).
+# Set DRAFT to "draft" to run LaTeX in draft mode (i.e., make DRAFT=draft xxx).
 #
 DRAFT=
 #
+# Set PAPER_SIZE to an appropriate LaTeX value to change the paper size
+# (e.g., make PAPER_SIZE=letterpaper xxx).
+#
+ifndef PAPER_SIZE
+PAPER_SIZE=a4paper
+endif
+#
+# Set FONT_SIZE to an appropriate LaTeX value to change the font size
+# (e.g., make FONT_SIZE=10pt xxx).
+#
+ifndef FONT_SIZE
+FONT_SIZE=12pt
+endif
+#
 # Specify LaTeX document options (comma-separated list).
 # We need to add a comma if there is something there already!
 #
 ifdef LATEX_OPTS
-ifdef DRAFT
 LATEX_OPTS+=,
 endif
-endif
-LATEX_OPTS+=$(DRAFT)
+LATEX_OPTS=$(FONT_SIZE),$(PAPER_SIZE),$(DRAFT)
 #
 # List of standard "phony" build targets.
 #