Hello!
I'm using Eclipse with the Arduino CDT plugin, and I'm trying to use the PS2X library in my project but am running into some issues. I extracted the library zip file into the Arduino CDT's libraries folder, and after that I went into Eclipse, right clicked on my project, went into Properties>Libraries and tried to include the PS2X library in my project, but the library was not showing up. I restarted Eclipse multiple times during this process. I've had success with being able to include other libraries, though. Any help would be greatly appreciated. 
Thanks for reading!