Draft of a developer guide for mulle-objc.
bundle exec jekyll serve -d /tmp/_siteor use mulle-dockerize and just say:
jekyll serve -d /tmp/_siteUpdate packages with sudo bundle update.
Check https://stackoverflow.com/questions/46377667/docker-for-mac-mkmf-rb-cant-find-header-files-for-ruby if you run into problems with missing ruby headers.