I'm using the latest cl-opengl, cffi, babel, alexandria and trivial-features, and I get the following errors when I try to run glut examples:
[3]> (cl-glut-examples:gears)
*** - FFI::WRITE-MEMORY-AS: 5.0s0 cannot be converted to the foreign type SINGLE-FLOAT
[3]> (cl-glut-examples:rb-robot)
*** - FFI::FOREIGN-CALL-OUT: 0.0s0 cannot be converted to the foreign type SINGLE-FLOAT
I've tried several versions of CLisp, it happens on all of them.