CFFI can be obtained through one of the following means available through its website:
In addition, you will need to obtain and install the following dependencies:
*features*
across
multiple Common Lisp implementations.
Furthermore, if you wish to run the testsuite, RT is required.
You may find mechanisms such as clbuild (recommended) or ASDF-Install (not as recommendable) helpful in getting and managing CFFI and its dependencies.