Hello
Thanks you for your answer. I am in a private school, which is new in Berlin and .. there is few assistants and they don't konw all the problems of all the libraries that we use ...
I actually don'tknow the command ot get the exact version of the sfml, but I just resinstalled the SFML yesterday, and updated it.
For exemple as code, i use the main test which should display a circle with she sames command lines :
https://www.sfml-dev.org/tutorials/2.5/start-linux.phpAnd i get this compilation error :
/usr/bin/ld: main.o: in function `main':
main.cpp:(.text+0xfc): undefined reference to `sf::CircleShape::CircleShape(float, unsigned int)'
collect2: error: ld returned 1 exit status
This is one of my first problem ...