diff --git a/make/tex.mk b/make/tex.mk
index 0ed20c44..277089d1 100644
--- a/make/tex.mk
+++ b/make/tex.mk
@@ -257,7 +257,7 @@ $(OUT).html.zip: $(HTMLDIR)
 
 $(OUTPUT).pdf: $(GENERATED)
 	@echo "-- creating pdf file"
-	pdflatex $(MAIN).tex;  pdflatex $(MAIN).tex;  pdflatex $(MAIN).tex  
+	for i in 1 2 3 ; do echo "==== pass $$i"; pdflatex $(MAIN).tex 2>&1 | grep -ve "Underfull\|Overfull"| grep .;  done
 	mv $(MAIN).pdf $(OUTPUT).pdf
 
 $(OUT).pdf.zip: $(OUTPUT).pdf