While compiling mcclim from a cvs checkout of 2006-02-08 using the latest cmucl snapshot, I get an error when compiling Backend/Postscript/sheet.lisp. The error message is Error in function PCL::CPL-ERROR: While computing the class precedence list of the class named POSTSCRIPT-STREAM: The class named CLIM-INTERNALS::UPDATING-OUTPUT-STREAM-MIXIN is a forward referenced class. The class named CLIM-INTERNALS::UPDATING-OUTPUT-STREAM-MIXIN is a direct superclass of the class named POSTSCRIPT-STREAM.. [Condition of type SIMPLE-ERROR] I guess this might be a bug in cmucl's PCL. Ray