It can be found at http://quotenil.com/git/?p=cl-libsvm.git;a=summary.
ASDF-install package (obsolete) http://quotenil.com/cl-libsvm/cl-libsvm-latest.tar.gz
An alternative to cl-libsvm is cl-svm, which is implemented in pure lisp.
cl-libsvm
Common Lisp wrapper for the libsvm support vector machine machine learning/AI library by Ravenpack,
Gabor Melis.