Some test results from me: SBCL on Mac OSX: no unexpected failures ACL 8.2 x86_64 on Mac OSX: crash in test. This is the test: #-cffi-features:no-long-long (progn (defcfun "my_llabs" :long-long (n :long-long)) (deftest defcfun.long-long (my-llabs -9223372036854775807) 9223372036854775807)) I believe that ACL has no long long --- why is this test executed? I see this in cffi-allegro.lisp: #-64bit (pushnew 'no-long-long *features*) (pushnew 'flat-namespace *features*) Since I am running a 64-bit allegro, I believe that the #-64bit should simply be removed. Also, probably we should fix the test so that it fails, instead of crashing in compilation... With no-long-long added to the feature set, I see: 10 unexpected failures: FUNCALL.LONG-LONG, FUNCALL.VARARGS.DOUBLE, DEFCFUN.VARARGS.FLOAT, DEFCFUN.VARARGS.DOUBLE, DEFCFUN.BFF.1, POINTERP.4, POINTERP.5, POINTER-EQ.NON-POINTERS.1, POINTER-EQ.NON-POINTERS.2, NULL-POINTER-P.NON-POINTER.2. CCL 1.7 on Mac OSX: no unexpected failures Hope that helps, r