In this question: Installing fltk on VirtualBox the asker wrote:

Can someone give a very specific step-by-step instruction on how to install it?

The next day fixer1234 posted this comment asking for more information.

This will be easier to answer if you describe what you've tried and what problems you experienced. Assuming you are following some instructions, it isn't working as intended. Some detail on what's happening will help people figure out where the problem might lie.

Three hours later I answered the question giving specific step-by-step instructions and my answer was accepted, however the question was downvoted three times and closed as too broad. I think the problem may have been that the question had built up enough momentum to close it that closing it was at that point was unstoppable, even though it still doesn't seem too broad to me. So I am requesting that this question be reopened.