I am trying to install GSLL in SBCL.  When I type 

(ql:quickload "gsll-tests")

I get the following error message

(CFFI::FL-ERROR
 "Unable to load foreign library (~A).~%  ~A"
 #:LIBRARY-818
 "Error opening shared object \"libffi.so\":
  libffi.so: cannot open shared object file: No such file or directory.")

I have just installed the latest version of libffi, and libffi.so exists and is located at:

/usr/local/lib/libffi.so

Thank you!

Laurence