change the Makefile to prevent an infinite loop
Index: pycode-browser/pybooksrc/Makefile
===================================================================
--- pycode-browser.orig/pybooksrc/Makefile
+++ pycode-browser/pybooksrc/Makefile
@@ -16,6 +16,6 @@ install:
 %.pdf: %.tex
 	pdflatex $<
 	logfile=$$(echo $< | sed 's/tex/log/'); \
-	while (grep  Warning $${logfile}| grep -iq run); do \
+	set -e; while grep  -q Rerun $${logfile}; do \
 	  pdflatex $<; \
 	done