test BTYD and R.rsp after the knitr fix
libprotoc-dev depends on libprotoc-dev, which needs to be installed
forgot install
R.rsp needs the titlesec package
yihui updated branch pkg/knitr Sat Oct  4 17:38:22 CDT 2014
yihui updated branch pkg/knitr Sun Oct  5 11:38:48 CDT 2014