The :i386 portion if the library specifies the i386 architecture which you are not running.
Use whatever package manager your install in the rpi has to install the newest libusb.
Are you using raspbian or a debian derived system?
if so, "sudo apt-get install libusb" should work.
I am using raspbian and have almost no idea about Linux, I can send commands but dont understand what they do.
SO I copied your line - thats it. I think I need the fline libusb at first, or should I change the folder to fire this command?
OK, run this command and see which libusb is available.
apt-cache search 'libusb'
You might need to specify the version of libusb.
On this computer I get a bunch of non-matches plus libusb-0.1-4 - userspace USB programming library
libusb-1.0-0 - userspace USB programming library
libusb-1.0-0-dev - userspace USB programming library development files
libusb-1.0-doc - documentation for userspace USB programming
libusb-dev - userspace USB programming library development files
I would have to run
sudo apt-get install libusb-1.0.0