diff --git a/samples/Makefile b/samples/Makefile
index 7c28d62..bfc0eb0 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -14,17 +14,33 @@ HTMLS= \
 	naacl06-shinyama.html \
 	nlp2004slides.html
 
+TEXTS= \
+	simple1.txt \
+	simple2.txt \
+	dmca.txt \
+	f1040nr.txt \
+	i1040nr.txt \
+	jo.txt \
+	kampo.txt \
+	naacl06-shinyama.txt \
+	nlp2004slides.txt
+
 all:
 
 clean:
 	-rm $(HTMLS)
+	-rm $(TEXTS)
 
-test: $(HTMLS)
+test: htmls texts
+
+htmls: $(HTMLS)
+
+texts: $(TEXTS)
 
 .SUFFIXES: .pdf .html .sgml .txt
 .pdf.html:
-	$(PDF2TXT) -t html -o $@ $<
+	$(PDF2TXT) -t html $< > $@
 .pdf.sgml:
-	$(PDF2TXT) -t sgml -o $@ $<
+	$(PDF2TXT) -t sgml $< > $@
 .pdf.txt:
-	$(PDF2TXT) -t text -o $@ $<
+	$(PDF2TXT) -t text $< > $@