IMHO it would be great if we could get all new posts to (at least) the help forums to include filling out a questionnaire with basic stuff (that people always need and ask for) like:
What is your OS (Linux, OS X, Windows, Android, iOS, other (please tell us)?
What version of SFML do you use?
Did you compile SFML yourself or use pre-compiled binaries?
What compiler do you use (msvc, icc, gcc, clang, other)?
Are you linking SFML statically or dynamically?
Does your problem reproduce in debug builds, release builds, or both?
There may be other questions that are relevant to add to the list. But having the above answered by default on every help post (possibly hidden behind a spoiler so you only have to see them if you care) could cut down enormously on a lot of duplicate posts that just ask for more details (usually the ones mentioned above).