Hi I am using SBCL on MacOSX and when I try to load the latest GSLL it can't find the foreign libraries for libgslcblas and libgsl. Looking at the source from an earlier version I see that the "lib/"prefix has been omitted from the library names. One possible workaround would be to use "gsl-config --libs" and extract the library directory from that. if you are interested I can supply a patch. cheers