-# The following may be required for some versions of LEX/FLEX
-# $(LEX) -o$(COMMDIR)/lex_yy.c $(COMMDIR)/lexer.l
+# Try one of these if the above line doesn't work.
+# Alternative syntax (1)
+# $(LEX) -t -L $(COMMDIR)/lexer.l > $(COMMDIR)/lex_yy.c
+# Alternative syntax (2)
+# $(LEX) -L -o$(COMMDIR)/lex_yy.c $(COMMDIR)/lexer.l