Any idea when / how nibbles will be getting updated ?

I too am having this problem - I'd like to investigate MCCLIM .

My backtrace, from sbcl-2.1.6, on x86_64 linux, under SLIME 2.26 :


CL-USER> (ql:quickload "mcclim")
...
[package 3bz].................
failed AVER:
    (NOT (EQUAL SB-X86-64-ASM::SIZES '(:DWORD :QWORD)))
This is probably a bug in SBCL itself. (Alternatively, SBCL
might have been corrupted by bad user code, e.g. by an undefined
Lisp operation like (FMAKUNBOUND 'COMPILE), or by stray pointers
from alien code or from unsafe Lisp code; or there might be a
bug in the OS or hardware that SBCL is running on.) If it seems
to be a bug in SBCL itself, the maintainers would like to know
about it. Bug reports are welcome on the SBCL mailing lists,
which you can find at <http://sbcl.sourceforge.net/>.
   [Condition of type SB-INT:BUG]

Restarts:
 0: [RETRY] Retry compiling #<CL-SOURCE-FILE "3bz" "deflate">.
 1: [ACCEPT] Continue, treating compiling #<CL-SOURCE-FILE "3bz" "deflate"> as having been successful.
 2: [RETRY] Retry ASDF operation.
 3: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the configuration.
 4: [RETRY] Retry ASDF operation.
 5: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the configuration.
 --more--

Backtrace:
  0: ("MOVZX" #<SB-ASSEM:SEGMENT {1008D5E403}> (:DWORD :QWORD) RCX #<SB-X86-64-ASM::EA  base=#<SB-C:TN t1[RCX] :LOAD> index=#<SB-C:TN t2[RAX] :NORMAL> disp=1>)
  1: (SB-ASSEM::%ASSEMBLE #<SB-ASSEM:SEGMENT {1008D5E403}> (#<SB-ASSEM::STMT IGNORE {1008C2BCC3}> . #<SB-ASSEM::STMT .ALIGN {1008D5E5C3}>))
  2: (SB-ASSEM:ASSEMBLE-SECTIONS #S(SB-ASSEM::ASMSTREAM :DATA-SECTION (#<SB-ASSEM::STMT IGNORE {1008C2BCC3}> . #<SB-ASSEM::STMT .ALIGN {1008D5E5C3}>) :CODE-SECTION (#1=#<SB-ASSEM::STMT IGNORE {1008C2BD13}>..
  3: (SB-C::GENERATE-CODE #<SB-C:COMPONENT :NAME (FLET 3BZ::SAVE-STATE :IN 3BZ::DECOMPRESS-DEFLATE/VECTOR) {1008909BB3}>)
  4: (SB-C::%COMPILE-COMPONENT #<SB-C:COMPONENT :NAME (FLET 3BZ::SAVE-STATE :IN 3BZ::DECOMPRESS-DEFLATE/VECTOR) {1008909BB3}>)
  5: (SB-C::COMPILE-COMPONENT #<SB-C:COMPONENT :NAME (FLET 3BZ::SAVE-STATE :IN 3BZ::DECOMPRESS-DEFLATE/VECTOR) {1008909BB3}>)
  6: (SB-C::%COMPILE (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::READ-CONTEXT 3BZ::STATE) (DECLARE (SB-C::TOP-LEVEL-FORM)) (BLOCK 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::WITH-VECTOR-CONTEXT # #)..
  7: (SB-C::FOPCOMPILE-FUNCTION #<SB-FASL:FASL-OUTPUT "/usr/share/common-lisp/sbcl-2.1.6-1.fc34-linux-x64/usr/share/common-lisp/quicklisp/dists/quicklisp/software/3bz-20201220-git/deflate-tmp1GA879MW.fasl"..
  8: (SB-C::FOPCOMPILE (SB-IMPL::%DEFUN (QUOTE 3BZ::DECOMPRESS-DEFLATE/VECTOR) (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::READ-CONTEXT 3BZ::STATE) (DECLARE #) (BLOCK 3BZ::DECOMPRESS-DEFLATE/..
  9: (SB-C::CONVERT-AND-MAYBE-COMPILE (SB-IMPL::%DEFUN (QUOTE 3BZ::DECOMPRESS-DEFLATE/VECTOR) (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::READ-CONTEXT 3BZ::STATE) (DECLARE #) (BLOCK 3BZ::DECO..
 10: (SB-C::PROCESS-TOPLEVEL-FORM (SB-IMPL::%DEFUN (QUOTE 3BZ::DECOMPRESS-DEFLATE/VECTOR) (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::READ-CONTEXT 3BZ::STATE) (DECLARE #) (BLOCK 3BZ::DECOMPRE..
 11: (SB-C::PROCESS-TOPLEVEL-PROGN ((EVAL-WHEN (:COMPILE-TOPLEVEL) (SB-C:%COMPILER-DEFUN # T NIL NIL)) (SB-IMPL::%DEFUN (QUOTE 3BZ::DECOMPRESS-DEFLATE/VECTOR) (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFLATE/V..
 12: (SB-C::PROCESS-TOPLEVEL-FORM (PROGN (EVAL-WHEN (:COMPILE-TOPLEVEL) (SB-C:%COMPILER-DEFUN # T NIL NIL)) (SB-IMPL::%DEFUN (QUOTE 3BZ::DECOMPRESS-DEFLATE/VECTOR) (SB-INT:NAMED-LAMBDA 3BZ::DECOMPRESS-DEFL..
 13: (SB-C::PROCESS-TOPLEVEL-FORM (DEFUN 3BZ::DECOMPRESS-DEFLATE/VECTOR (3BZ::READ-CONTEXT 3BZ::STATE) (3BZ::WITH-VECTOR-CONTEXT (3BZ::READ-CONTEXT) (LET NIL # #))) ((PROGN (DEFUN 3BZ::DECOMPRESS-DEFLATE/V..
 14: (SB-C::PROCESS-TOPLEVEL-PROGN ((DEFUN 3BZ::DECOMPRESS-DEFLATE/VECTOR #1=(3BZ::READ-CONTEXT 3BZ::STATE) (3BZ::WITH-VECTOR-CONTEXT # #)) (DEFUN 3BZ::DECOMPRESS-DEFLATE/STREAM #1# (3BZ::WITH-STREAM-CONTE..
 15: (SB-C::PROCESS-TOPLEVEL-FORM (PROGN (DEFUN 3BZ::DECOMPRESS-DEFLATE/VECTOR #1=(3BZ::READ-CONTEXT 3BZ::STATE) (3BZ::WITH-VECTOR-CONTEXT # #)) (DEFUN 3BZ::DECOMPRESS-DEFLATE/STREAM #1# (3BZ::WITH-STREAM-..
 16: (SB-C::PROCESS-TOPLEVEL-FORM (3BZ::DEFUN-WITH-READER-CONTEXTS 3BZ::DECOMPRESS-DEFLATE (3BZ::READ-CONTEXT 3BZ::STATE) (3BZ::READ-CONTEXT) (DECLARE (OPTIMIZE SPEED)) (3BZ::WITH-CACHED-STATE (3BZ::STATE ..
 17: ((LAMBDA (SB-KERNEL:FORM &KEY :CURRENT-INDEX &ALLOW-OTHER-KEYS) :IN SB-C::SUB-COMPILE-FILE) (3BZ::DEFUN-WITH-READER-CONTEXTS 3BZ::DECOMPRESS-DEFLATE (3BZ::READ-CONTEXT 3BZ::STATE) (3BZ::READ-CONTEXT) ..
 18: (SB-C::%DO-FORMS-FROM-INFO #<FUNCTION (LAMBDA (SB-KERNEL:FORM &KEY :CURRENT-INDEX &ALLOW-OTHER-KEYS) :IN SB-C::SUB-COMPILE-FILE) {52C14D7B}> #<SB-C::SOURCE-INFO {1004A43BD3}> SB-C::INPUT-ERROR-IN-COMP..
 19: ((FLET "LAMBDA0" :IN "SYS:SRC;COMPILER;MAIN.LISP"))
 20: ((FLET SB-C::WITH-IT :IN SB-C::%WITH-COMPILATION-UNIT))
 21: (SB-C::SUB-COMPILE-FILE #<SB-C::SOURCE-INFO {1004A43BD3}> NIL)
 22: (COMPILE-FILE #P"/usr/share/common-lisp/quicklisp/dists/quicklisp/software/3bz-20201220-git/deflate.lisp" :OUTPUT-FILE #P"/usr/share/common-lisp/sbcl-2.1.6-1.fc34-linux-x64/usr/share/common-lisp/quick..
 23: (UIOP/UTILITY:CALL-WITH-MUFFLED-CONDITIONS #<FUNCTION (LAMBDA NIL :IN UIOP/LISP-BUILD:COMPILE-FILE*) {1004A42CAB}> NIL)
 24: (UIOP/PATHNAME:CALL-WITH-ENOUGH-PATHNAME #P"/usr/share/common-lisp/quicklisp/dists/quicklisp/software/3bz-20201220-git/deflate.lisp" NIL #<FUNCTION (LAMBDA (UIOP/LISP-BUILD::INPUT-FILE) :IN UIOP/LISP-..
 25: (UIOP/LISP-BUILD:COMPILE-FILE* #P"/usr/share/common-lisp/quicklisp/dists/quicklisp/software/3bz-20201220-git/deflate.lisp" :OUTPUT-FILE #P"/usr/share/common-lisp/sbcl-2.1.6-1.fc34-linux-x64/usr/share/..
 26: (ASDF/LISP-ACTION:PERFORM-LISP-COMPILATION #<ASDF/LISP-ACTION:COMPILE-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "3bz" "deflate">)
 27: ((SB-PCL::EMF ASDF/ACTION:PERFORM) #<unused argument> #<unused argument> #<ASDF/LISP-ACTION:COMPILE-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "3bz" "deflate">)
 28: ((LAMBDA NIL :IN ASDF/ACTION:CALL-WHILE-VISITING-ACTION))
 29: ((:METHOD ASDF/ACTION:PERFORM-WITH-RESTARTS :AROUND (T T)) #<ASDF/LISP-ACTION:COMPILE-OP > #<ASDF/LISP-ACTION:CL-SOURCE-FILE "3bz" "deflate">) [fast-method]
 30: ((:METHOD ASDF/PLAN:PERFORM-PLAN (T)) #<ASDF/PLAN:SEQUENTIAL-PLAN {100344BB13}>) [fast-method]
 31: ((FLET SB-C::WITH-IT :IN SB-C::%WITH-COMPILATION-UNIT))
 32: ((:METHOD ASDF/PLAN:PERFORM-PLAN :AROUND (T)) #<ASDF/PLAN:SEQUENTIAL-PLAN {100344BB13}>) [fast-method]
 33: ((:METHOD ASDF/OPERATE:OPERATE (ASDF/OPERATION:OPERATION ASDF/COMPONENT:COMPONENT)) #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/SYSTEM:SYSTEM "mcclim"> :PLAN-CLASS NIL :PLAN-OPTIONS NIL) [fast-method]
 34: ((SB-PCL::EMF ASDF/OPERATE:OPERATE) #<unused argument> #<unused argument> #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/SYSTEM:SYSTEM "mcclim"> :VERBOSE NIL)
 35: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
 36: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) #<ASDF/LISP-ACTION:LOAD-OP > #<ASDF/SYSTEM:SYSTEM "mcclim"> :VERBOSE NIL) [fast-method]
 37: ((SB-PCL::EMF ASDF/OPERATE:OPERATE) #<unused argument> #<unused argument> ASDF/LISP-ACTION:LOAD-OP "mcclim" :VERBOSE NIL)
 38: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
 39: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) ASDF/LISP-ACTION:LOAD-OP "mcclim" :VERBOSE NIL) [fast-method]
 40: (ASDF/SESSION:CALL-WITH-ASDF-SESSION #<FUNCTION (LAMBDA NIL :IN ASDF/OPERATE:OPERATE) {100332508B}> :OVERRIDE T :KEY NIL :OVERRIDE-CACHE T :OVERRIDE-FORCING NIL)
 41: ((LAMBDA NIL :IN ASDF/OPERATE:OPERATE))
 42: (ASDF/SESSION:CALL-WITH-ASDF-SESSION #<FUNCTION (LAMBDA NIL :IN ASDF/OPERATE:OPERATE) {100331E32B}> :OVERRIDE NIL :KEY NIL :OVERRIDE-CACHE NIL :OVERRIDE-FORCING NIL)
 43: ((:METHOD ASDF/OPERATE:OPERATE :AROUND (T T)) ASDF/LISP-ACTION:LOAD-OP "mcclim" :VERBOSE NIL) [fast-method]
 44: (ASDF/OPERATE:LOAD-SYSTEM "mcclim" :VERBOSE NIL)
 45: (QUICKLISP-CLIENT::CALL-WITH-MACROEXPAND-PROGRESS #<FUNCTION (LAMBDA NIL :IN QUICKLISP-CLIENT::APPLY-LOAD-STRATEGY) {100331E0FB}>)
 46: (QUICKLISP-CLIENT::AUTOLOAD-SYSTEM-AND-DEPENDENCIES "mcclim" :PROMPT NIL)
 47: ((:METHOD QL-IMPL-UTIL::%CALL-WITH-QUIET-COMPILATION (T T)) #<unused argument> #<FUNCTION (FLET QUICKLISP-CLIENT::QL :IN QUICKLISP-CLIENT:QUICKLOAD) {1003D330BB}>) [fast-method]
 48: ((:METHOD QL-IMPL-UTIL::%CALL-WITH-QUIET-COMPILATION :AROUND (QL-IMPL:SBCL T)) #<QL-IMPL:SBCL {1004FE46A3}> #<FUNCTION (FLET QUICKLISP-CLIENT::QL :IN QUICKLISP-CLIENT:QUICKLOAD) {1003D330BB}>) [fast-m..
 49: ((:METHOD QUICKLISP-CLIENT:QUICKLOAD (T)) "mcclim" :PROMPT NIL :SILENT NIL :VERBOSE NIL) [fast-method]
 50: (QL-DIST::CALL-WITH-CONSISTENT-DISTS #<FUNCTION (LAMBDA NIL :IN QUICKLISP-CLIENT:QUICKLOAD) {1003D23A8B}>)
 51: (SB-INT:SIMPLE-EVAL-IN-LEXENV (QUICKLISP-CLIENT:QUICKLOAD "mcclim") #<NULL-LEXENV>)
 52: (EVAL (QUICKLISP-CLIENT:QUICKLOAD "mcclim"))
 53: (SWANK::EVAL-REGION "(ql:quickload \"mcclim\") ..)
 54: ((LAMBDA NIL :IN SWANK-REPL::REPL-EVAL))
 55: (SWANK-REPL::TRACK-PACKAGE #<FUNCTION (LAMBDA NIL :IN SWANK-REPL::REPL-EVAL) {1003D2322B}>)
 56: (SWANK::CALL-WITH-RETRY-RESTART "Retry SLIME REPL evaluation request." #<FUNCTION (LAMBDA NIL :IN SWANK-REPL::REPL-EVAL) {1003D231CB}>)
 57: (SWANK::CALL-WITH-BUFFER-SYNTAX NIL #<FUNCTION (LAMBDA NIL :IN SWANK-REPL::REPL-EVAL) {1003D231AB}>)
 58: (SWANK-REPL::REPL-EVAL "(ql:quickload \"mcclim\") ..)
 59: (SB-INT:SIMPLE-EVAL-IN-LEXENV (SWANK-REPL:LISTENER-EVAL "(ql:quickload \"mcclim\") ..)
 60: (EVAL (SWANK-REPL:LISTENER-EVAL "(ql:quickload \"mcclim\") ..)
 61: (SWANK:EVAL-FOR-EMACS (SWANK-REPL:LISTENER-EVAL "(ql:quickload \"mcclim\") ..)
 62: (SWANK::PROCESS-REQUESTS NIL)
 63: ((LAMBDA NIL :IN SWANK::HANDLE-REQUESTS))
 64: ((LAMBDA NIL :IN SWANK::HANDLE-REQUESTS))
 65: (SWANK/SBCL::CALL-WITH-BREAK-HOOK #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK {53597E8B}> #<FUNCTION (LAMBDA NIL :IN SWANK::HANDLE-REQUESTS) {1003B97F7B}>)
 66: ((FLET SWANK/BACKEND:CALL-WITH-DEBUGGER-HOOK :IN "/usr/share/common-lisp/quicklisp/dists/quicklisp/software/slime-v2.26.1/swank/sbcl.lisp") #<FUNCTION SWANK:SWANK-DEBUGGER-HOOK {53597E8B}> #<FUNCTION ..
 67: (SWANK::CALL-WITH-BINDINGS ((*STANDARD-INPUT* . #<SWANK/GRAY::SLIME-INPUT-STREAM {10021AC8E3}>)) #<FUNCTION (LAMBDA NIL :IN SWANK::HANDLE-REQUESTS) {1003B97F9B}>)
 68: (SWANK::HANDLE-REQUESTS #<SWANK::MULTITHREADED-CONNECTION {1004A54303}> NIL)
 69: ((FLET SB-UNIX::BODY :IN SB-THREAD::RUN))
 70: ((FLET "WITHOUT-INTERRUPTS-BODY-11" :IN SB-THREAD::RUN))
 71: ((FLET SB-UNIX::BODY :IN SB-THREAD::RUN))
 72: ((FLET "WITHOUT-INTERRUPTS-BODY-4" :IN SB-THREAD::RUN))
 73: (SB-THREAD::RUN)
 74: ("foreign function: call_into_lisp")
 75: ("foreign function: funcall1")