I'm not english, I'm french 
bonjour, j'ai un problème, je n'arrive pas a utiliser la librairie RXTX en java, l'installation ne marche pas comment faire. Pouvez vous me montrer comment l'installer s'il vous plait. Thank you.
I'm not english, I'm french
So? If you want to post in French, don't do it here. There is a section of the forum for posting in French.
Google translate:
"Hello, I have a problem I can not seem to use the RXTX library in Java, the installation does not work how. Can you show me how to install it please."
You may want to explain what exactly is not working. If you are comfortable reading English, then this link may help: