remove pkgs_old from apt-get **after** the recipes have been installed, e.g. fftw is an old package, but we should install libfftw3-dev anyway
remove pkgs_old from apt-get **after** the recipes have been installed, e.g. fftw is an old package, but we should install libfftw3-dev anyway

yihui/crandalf,yihui/crandalf