OCI8/Oracle not activated

[superakoon]

I've tried activating it in by typing /opt/lampp/lampp oci8 in the terminal
After asking for the path to Oracle or Instant Client application, I typed in the new directory I created which is /opt/lampp/oracle, it fails to activate OCI8 and says, "Can't find libclntsh.so. Sorry."
What do I have to do?
Thanks in advance.