GiL (Gecode interface Lisp) is a wrapper that allows to use Gecode in Lisp program.
Install Gecode, a Common Lisp implementation and CFFI. You are ready to load the library and use it! A small example with the SEND+MORE=MONEY problem is shown in the Gil introduction pdf from my master's thesis. The example is first gievn in Lisp, then in C++.
GiL does not provide full wrapping of Gecode. The Gil introduction pdf explains what is missing and suggests ways to improve it.