The .a are already there, I had downloaded a zip, sometime ago
Why didn't you say that the first time I asked? ...
I thought you understood at reply#20 when I indicated that sfml .a are in libs/ (library folder) and not in build/ (compilation folder), sorry.
Ok, I understood concerning the .so and .a, so what I just did is getting the GCCx64 release of SFML 2.3.2 on your site, and I put all the .so/.so2.3/.so2.3.2 in my folder PROJECT FOLDER > libs > SFML-2.3.2 > lib.
Now there is only one error (no more undefined ref) :
PROJECT FOLDER/libs/SFML-2.3.2/lib/libsfml-audio.so :
fichier non reconnu : Fichier tronqué
collect2: error: ld returned 1 exit status
make[2]: *** [runner] Erreur 1
make[1]: *** [CMakeFiles/runner.dir/all] Erreur 2
make: *** [all] Erreur 2
I know I shouldn't take the 3 : .so / .so2.3 / .so2.3.2 but I don't know which one(s) I should take only.