Hello, Here is an error report while loading the latest gsll (with all fasl's removed) on a 64-bit linux with sbcl: error while parsing arguments to DESTRUCTURING-BIND: unknown keyword: :TYPE; expected one of :OPTIONAL, :DOCUMENTATION [Condition of type SB-KERNEL::DEFMACRO-LAMBDA-LIST-BROKEN-KEY-LIST-ERROR] Restarts: 0: [TRY-RECOMPILING] Try recompiling mksa 1: [RETRY] Retry performing #<ASDF:COMPILE-OP NIL {1005EEFEF1}> on #<CFFI-GROVEL:GROVEL-FILE "mksa" {10069A0561}>. 2: [ACCEPT] Continue, treating #<ASDF:COMPILE-OP NIL {1005EEFEF1}> on #<CFFI-GROVEL:GROVEL-FILE "mksa" {10069A0561}> as having been successful. 3: [RETRY] Retry SLIME REPL evaluation request. 4: [ABORT] Return to SLIME's top level. 5: [ABORT] Exit debugger, returning to top level. Backtrace: 0: ((SB-PCL::FAST-METHOD CFFI-GROVEL::%PROCESS-GROVEL-FORM ((EQL 'CFFI-GROVEL::CONSTANT) T T)) ..) 1: (CFFI-GROVEL::GENERATE-C-FILE ..) 2: (CFFI-GROVEL:PROCESS-GROVEL-FILE ..) 3: ((SB-PCL::FAST-METHOD ASDF:PERFORM (ASDF:COMPILE-OP CFFI-GROVEL:GROVEL-FILE)) ..) 4: ((LAMBDA (SB-PCL::.PV. SB-PCL::.NEXT-METHOD-CALL. SB-PCL::.ARG0. SB-PCL::.ARG1.)) ..) 5: ((SB-PCL::FAST-METHOD ASDF:PERFORM :AROUND (ASDF:COMPILE-OP CFFI-GROVEL::CC-FLAGS-MIXIN)) ..) 6: ((SB-PCL::FAST-METHOD ASDF:PERFORM ASDF:AROUND (ASDF:COMPILE-OP ASDF:CL-SOURCE-FILE)) ..) 7: ((LAMBDA ())) 8: ((FLET SB-THREAD::WITH-RECURSIVE-LOCK-THUNK)) 9: (SB-C::%WITH-COMPILATION-UNIT #<CLOSURE (LAMBDA #) {1002DB71C9}>)[:EXTERNAL] 10: (ASDF:OPERATE ASDF:LOAD-OP "gsll")[:EXTERNAL] 11: ((LAMBDA (FUNCTION)) #<CLOSURE (LAMBDA #) {10046565D9}>) 12: ((LAMBDA ())) It seems that I can safely skip this file (option 2). I looked in the physical constants directory, and could not find anything meaningful to me. Cheers, Mirko