While it may seem obvious from a reading of the Filesystem Hierarchy Standard, no Fedora package should put files or directories in /opt or /usr/local. Recently, with the "Stacks" discussion, it became clear that their intent was to put files in /opt, so I wanted to make sure that the Guidelines clearly forbid that.

(Note: It is still possible to implement stacks using alternatives, environment modules, or careful versioning in binary names.)