cl-gsll fails to load

[Foo Chuan Wei <chuanwei.foo@hotmail.com>]

I am using Guix on Ubuntu 20.04, and SBCL 2.1.9 (installed using `guix
install sbcl`). I have installed cl-gsll (`guix install cl-gsll`), but
`(asdf:load-system :gsll)` fails. Why?

This is my ASDF configuration

--8<---------------cut here---------------start------------->8---
;;;; File: ~/.config/common-lisp/source-registry.conf.d/guix-asdf.conf
(:tree "~/.guix-profile/share/common-lisp/")
--8<---------------cut here---------------end--------------->8---

This is the error message when `(asdf:load-system :gsll)` fails:

--8<---------------cut here---------------start------------->8---
; pkg-config libffi --cflags
; ERROR: Couldn't execute "pkg-config": No such file or directory


; Attempting to continue anyway.
; gcc -o /home/fcw/.cache/common-lisp/sbcl-2.1.9-linux-x64/gnu/store/5c2r9qg7krpnsqiia34jf6s8w71vgqsf-cl-cffi-0.24.1/share/common-lisp/source/cl-cffi/libffi/libffi-types__grovel-tmpTASQCYAW.o -c -g -Wall -Wundef -Wsign-compare -Wpointer-arith -O3 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -Wunused-parameter -fno-omit-frame-pointer -momit-leaf-frame-pointer -fPIC -I/gnu/store/5c2r9qg7krpnsqiia34jf6s8w71vgqsf-cl-cffi-0.24.1/share/common-lisp/source/cl-cffi/ /home/fcw/.cache/common-lisp/sbcl-2.1.9-linux-x64/gnu/store/5c2r9qg7krpnsqiia34jf6s8w71vgqsf-cl-cffi-0.24.1/share/common-lisp/source/cl-cffi/libffi/libffi-types__grovel.c
While evaluating the form starting at line 21, column 0
  of #P"/gnu/store/q27bpjg4pcm81j9ij66fhdpvlwx3jdcz-cl-gsll-0.0.0-1.1a8ada2/share/common-lisp/source/cl-gsll/gsll.asd":

debugger invoked on a ASDF/FIND-SYSTEM:LOAD-SYSTEM-DEFINITION-ERROR in thread #<THREAD "main thread" RUNNING {10018587C3}>: Error while trying to load definition for system gsll from pathname /gnu/store/q27bpjg4pcm81j9ij66fhdpvlwx3jdcz-cl-gsll-0.0.0-1.1a8ada2/share/common-lisp/source/cl-gsll/gsll.asd: Couldn't execute "gcc": No such file or directory

Type HELP for debugger help, or (SB-EXT:EXIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [RETRY                        ] Retry #<PROCESS-OP > on #<GROVEL-FILE "cffi-libffi" "libffi" "libffi-types">.
  1: [ACCEPT                       ] Continue, treating #<PROCESS-OP > on #<GROVEL-FILE "cffi-libffi" "libffi" "libffi-types"> as having been successful.
  2: [RETRY                        ] Retry EVAL of current toplevel form.
  3: [CONTINUE                     ] Ignore error and continue loading file "/gnu/store/q27bpjg4pcm81j9ij66fhdpvlwx3jdcz-cl-gsll-0.0.0-1.1a8ada2/share/common-lisp/source/cl-gsll/gsll.asd".
  4: [ABORT                        ] Abort loading file "/gnu/store/q27bpjg4pcm81j9ij66fhdpvlwx3jdcz-cl-gsll-0.0.0-1.1a8ada2/share/common-lisp/source/cl-gsll/gsll.asd".
  5:                                 Retry #<DEFINE-OP > on #<UNDEFINED-SYSTEM "gsll">.
  6:                                 Continue, treating #<DEFINE-OP > on #<UNDEFINED-SYSTEM "gsll"> as having been successful.
  7:                                 Retry ASDF operation.
  8: [CLEAR-CONFIGURATION-AND-RETRY] Retry ASDF operation after resetting the configuration.
  9:                                 Retry ASDF operation.
 10:                                 Retry ASDF operation after resetting the configuration.
 11:                                 Exit debugger, returning to top level.

((FLET "H0" :IN ASDF/ACTION:PERFORM) #<CFFI-GROVEL:GROVEL-ERROR "~a" {100B957A93}>)
; File has been modified since compilation:
;   SYS:CONTRIB;ASDF;ASDF.LISP.NEWEST
; Using form offset instead of character position.
   error finding frame source: invalid feature expression: "#.(UIOP/UTILITY:SYMBOL-TEST-TO-FEATURE-EXPRESSION (COMMON-LISP:QUOTE #:COMPILER-ERROR-CONTEXT-%SOURCE) (COMMON-LISP:QUOTE #:SB-C))"
   source: NIL
0]
--8<---------------cut here---------------end--------------->8---

The problem does not appear when using sbcl-gsll instead of cl-gsll.
How do I fix the problem when using cl-gsll? It seems to be missing some
kind of input or native-input.