I tried to export to html and org told me to first install htmlize ( https://github.com/hniksic/emacs-htmlize).
I tried to find an emacs-htmlize in the package list, and found nothing, so I went to the github page and since saw it was a seemingly normal el package called htmlize I checked again in the packages, found it and installed it directly from emacs. Why doesn't org suggest to use package.el to install htmlize? That would be less confusing to users who don't have it installed by default. Jean-Christophe