Activating Redmine's roadmap

I recently installed Redmine and started configuring a plethora of items such as roles, statuses, projects, issues, and that kind of good stuff. But to my surprise I found no section for clustering issues into roadmaps. I've searched everywhere in the Administration's settings and there's nothing that could activate the section "Roadmaps" in Redmine's projects.

I'd appreciate some pointers as to what I have to do to activate roadmaps, be either by assigning permissions to roles or by changing settings.