diff --git a/gnu/packages/patches/racket-minimal-sh-via-rktio.patch b/gnu/packages/patches/racket-minimal-sh-via-rktio.patch
index b4fefd1514..6bc2ee8331 100644
--- a/gnu/packages/patches/racket-minimal-sh-via-rktio.patch
+++ b/gnu/packages/patches/racket-minimal-sh-via-rktio.patch
@@ -35,13 +35,13 @@ making this change at the C level is both:
       conditional and a runtime check that the file in the store exists,
       we make it much less likely that it will "leak" out of Guix.
 ---
- src/rktio/rktio_process.c | 21 ++++++++++++++++++++-
+ racket/src/rktio/rktio_process.c | 21 ++++++++++++++++++++-
  1 file changed, 20 insertions(+), 1 deletion(-)
 
-diff --git a/src/rktio/rktio_process.c b/src/rktio/rktio_process.c
+diff --git a/racket/src/rktio/rktio_process.c b/racket/src/rktio/rktio_process.c
 index 89202436c0..465ebdd5c5 100644
---- a/src/rktio/rktio_process.c
-+++ b/src/rktio/rktio_process.c
+--- a/racket/src/rktio/rktio_process.c
++++ b/racket/src/rktio/rktio_process.c
 @@ -1224,12 +1224,14 @@ int rktio_process_allowed_flags(rktio_t *rktio)
  /*========================================================================*/
  
diff --git a/gnu/packages/racket.scm b/gnu/packages/racket.scm
index c095de42b3..0349b77704 100644
--- a/gnu/packages/racket.scm
+++ b/gnu/packages/racket.scm
@@ -31,7 +31,9 @@
   #:use-module (srfi srfi-1)
   #:use-module (ice-9 match)
   #:use-module (gnu packages)
+  #:use-module (gnu packages autotools)
   #:use-module (gnu packages bash)
+  #:use-module (gnu packages chez)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages databases)
   #:use-module (gnu packages fontutils)
@@ -40,25 +42,87 @@
   #:use-module (gnu packages gtk)
   #:use-module (gnu packages image)
   #:use-module (gnu packages libedit)
+  #:use-module (gnu packages libffi)
   #:use-module (gnu packages multiprecision)
   #:use-module (gnu packages sqlite)
   #:use-module (gnu packages tls)
   #:use-module (gnu packages xorg))
 
+;; Commentary:
+;;
+;; Here's how bootstrapping minimal Racket works:
+;;
+;;   - Racket BC [CGC] can be built with only a C compiler (except for
+;;     one caveat discussed below).
+;;   - Racket BC [3M] needs an existing Racket to run "xform",
+;;     which transforms its own C source code to add additional annotations
+;;     for the precise garbage collector.
+;;   - Racket CS needs (bootfiles for) Racket's fork of Chez Scheme.
+;;     It also needs an existing Racket to compile Racket-implemented
+;;     parts of the runtime system to R6RS libraries.
+;;   - Chez Scheme also needs bootfiles for itself, but Racket can simulate
+;;     enough of Chez Scheme to load Racket's fork of the Chez Scheme compiler
+;;     purely from source into Racket and apply the compiler to itself,
+;;     producing the needed bootfiles (albeit very slowly).
+;;     Any variant of Racket since version 7.1 can run the simulation.
+;;
+;; So, we build CGC to build 3M to build bootfiles and CS.
+;;
+;; One remaining bootstrapping limitation is that Racket's reader, module
+;; system, and macro expander are implemented in Racket. For Racket CS,
+;; they are compiled to R6RS libraries as discussed above. This note from the
+;; README file applies to all such subsystems:
+;;
+;;     The Racket version must be practically the same as the current Racket
+;;     verson, although it can be the Racket BC implementation (instead of
+;;     the Racket CS implementation).
+;;
+;;     Unlike Chez Scheme boot files, the files generated in "schemified"
+;;     are human-readable and -editable Scheme code. That provides a way
+;;     out of bootstrapping black holes, even without BC.
+;;
+;; However, other Racket subsystems implemented in Racket for Racket CS
+;; use older C implementations for Racket BC, whereas the reader, expander,
+;; and module system were completely replaced with the Racket implementation
+;; as of Racket 7.0.
+;;
+;; For Racket BC, the compiled "linklet" s-expressions (primitive modules)
+;; are embeded in C as a static string constant. Eventually, they are further
+;; compiled by the C-implemented Racket BC bytecode and JIT compilers.
+;; (On platforms where Racket BC's JIT is not supported, yet another compiler
+;; instead compiles the linklets to C code, but this is not a bootstrapping
+;; issue.)
+;;
+;; Code:
 
-(define %installer-mirrors
-  ;; Source:
-  ;; https://github.com/racket/racket-lang-org/blob/master/download/data.rkt#L58
-  ;; Matthew Flatt says: "note that many are commented out"
-  ;; INVARIANT: End with a trailing "/"!
-  '("https://mirror.racket-lang.org/installers/"
-    "https://www.cs.utah.edu/plt/installers/"
-    "https://plt.cs.northwestern.edu/racket-mirror/"
-    "https://mirror.csclub.uwaterloo.ca/racket/racket-installers/"
-    ;; Universität Tübingen is using a self-signed HTTPS certificate:
-    "http://mirror.informatik.uni-tuebingen.de/mirror/racket/"
-    "https://racket.infogroep.be/"
-    ))
+(define cfg-flag:sh-for-rktio
+  `(string-append "CPPFLAGS=-DGUIX_RKTIO_PATCH_BIN_SH="
+                  (assoc-ref %build-inputs "sh")
+                  "/bin/sh"))
+(define cfg-flag:enable-lt
+  `(string-append "--enable-lt="
+                  (assoc-ref %build-inputs "libtool")
+                  "/bin/libtool"))
+(define cfg-flag:enable-racket
+  `(let ((racket (assoc-ref %build-inputs "racket")))
+     (string-append "--enable-racket="
+                    racket
+                    "/bin/racket")))
+
+(define unpack-nanopass+stex
+  ;; Copied from chez-scheme.
+  ;; TODO: Eventually, we should refactor Chez Scheme
+  ;; enough to share more directly, so that we can make
+  ;; Racket's version of Chez avalable as a Guix package,
+  ;; e.g. for architectures not supported upstream.
+  ;; For now, we let Racket drive the Chez build process
+  ;; other than this step.
+  `(for-each (lambda (dep)
+               (define src
+                 (assoc-ref (or native-inputs inputs) dep))
+               (copy-recursively src dep
+                                 #:keep-mtime? #t))
+             '("nanopass" "stex")))
 
 
 (define-public racket-minimal
@@ -67,96 +131,113 @@
     (version "8.2")            ; note: remember to also update racket!
     (source
      (origin
-       (method url-fetch)
-       (uri (map (lambda (base)
-                   (string-append base version "/racket-minimal-src.tgz"))
-                 %installer-mirrors))
-       (sha256 "13qfg56w554vdj5iwa8lpacy83s7bzhhyr44pjns68mkhj69ring")
-       (patches (search-patches
-                 "racket-minimal-sh-via-rktio.patch"))))
-    (home-page "https://racket-lang.org")
-    (synopsis "Racket without bundled packages such as DrRacket")
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/racket/racket")
+             (commit (string-append "v" version))))
+       (sha256
+        "061bhiyjlvazph0dj9i3i3x2q5z53rp8h5cjwg3frjimkr45lncn")
+       (file-name (git-file-name name version))
+       (patches (search-patches "racket-minimal-sh-via-rktio.patch"))
+       (snippet
+        (with-imported-modules '((guix build utils))
+          #~(begin
+              (use-modules (guix build utils))
+              ;; unbundle Chez submodules
+              (with-directory-excursion "racket/src/ChezScheme"
+                #$(origin-snippet (package-source chez-scheme)))
+              ;; unbundle libffi
+              (for-each
+               delete-file-recursively
+               '("racket/src/bc/foreign/libffi")))))))
     (inputs
-     `(("openssl" ,openssl)
+     `(;; common to all racket-minimal variants:
+       ("openssl" ,openssl)
        ("sqlite" ,sqlite)
        ("sh" ,bash-minimal)
+       ;; only for CS
        ("zlib" ,zlib)
        ("zlib:static" ,zlib "static")
        ("lz4" ,lz4)
        ("lz4:static" ,lz4 "static")))
+    (native-inputs
+     `(("bootfiles" ,racket-bootstrap-chez-bootfiles)
+       ,@(package-native-inputs racket-bootstrap-chez-bootfiles)))
     (build-system gnu-build-system)
     (arguments
      `(#:configure-flags
-       `(,(string-append "CPPFLAGS=-DGUIX_RKTIO_PATCH_BIN_SH="
-                         (assoc-ref %build-inputs "sh")
-                         "/bin/sh")
-         "--enable-libz"
-         "--enable-liblz4")
-       #:modules
-       ((guix build gnu-build-system)
-        (guix build utils)
-        (srfi srfi-1))
+       (list "--enable-csonly"
+             "--enable-libz"
+             "--enable-liblz4"
+             ,cfg-flag:enable-racket
+             ,cfg-flag:sh-for-rktio)
+       #:out-of-source? #true
+       ;; Tests are in packages like racket-test-core and
+       ;; main-distribution-test that aren't part of the main distribution.
+       #:tests? #f
+       #:modules ((ice-9 match)
+                  (guix build gnu-build-system)
+                  (guix build utils))
        #:phases
        (modify-phases %standard-phases
-         (add-before 'configure 'pre-configure-minimal
+         (add-after 'unpack 'unpack-nanopass+stex
+           (lambda* (#:key inputs native-inputs #:allow-other-keys)
+             (with-directory-excursion "racket/src/ChezScheme"
+               ,unpack-nanopass+stex)
+             #t))
+         (add-after 'unpack-nanopass+stex 'unpack-bootfiles
+           (lambda* (#:key inputs #:allow-other-keys)
+             (with-directory-excursion "racket/src/ChezScheme"
+               (copy-recursively
+                (string-append (assoc-ref inputs "bootfiles") "/boot")
+                "boot"))
+             #t))
+         (add-before 'configure 'initialize-config.rktd
            (lambda* (#:key inputs #:allow-other-keys)
-             (chdir "src")
+             (define (write-racket-hash alist)
+               ;; inside must use dotted pair notation
+               (display "#hash(")
+               (for-each (match-lambda
+                           ((k . v)
+                            (format #t "(~s . ~s)" k v)))
+                         alist)
+               (display ")\n"))
+             (mkdir-p "racket/etc")
+             (with-output-to-file "racket/etc/config.rktd"
+               (lambda ()
+                 (write-racket-hash
+                  `((lib-search-dirs
+                     . (#f ,@(map (lambda (lib)
+                                    (string-append (assoc-ref inputs lib)
+                                                   "/lib"))
+                                  '("openssl"
+                                    "sqlite"))))
+                    (catalogs
+                     . (,(string-append
+                          "https://download.racket-lang.org/releases/"
+                          ,version
+                          "/catalog/")
+                        #f))))))
              #t))
-         (add-after 'build 'patch-config.rktd-lib-search-dirs
-           (lambda* (#:key inputs outputs #:allow-other-keys)
-             ;; We do this between the `build` and `install` phases
-             ;; so that we have racket to read and write the hash table,
-             ;; but it comes before `raco setup`, when foreign libraries
-             ;; are needed to build the documentation.
-             (define out (assoc-ref outputs "out"))
-             (apply invoke
-                    "./cs/c/racketcs"
-                    "-e"
-                    ,(format #f
-                             "~s"
-                             '(let* ((args
-                                      (vector->list
-                                       (current-command-line-arguments)))
-                                     (file (car args))
-                                     (extra-lib-search-dirs (cdr args)))
-                                (write-to-file
-                                 (hash-update
-                                  (file->value file)
-                                  'lib-search-dirs
-                                  (lambda (dirs)
-                                    (append dirs extra-lib-search-dirs))
-                                  '(#f))
-                                 #:exists 'truncate/replace
-                                 file)))
-                    "--"
-                    "../etc/config.rktd"
-                    (filter-map (lambda (lib)
-                                  (cond
-                                   ((assoc-ref inputs lib)
-                                    => (lambda (pth)
-                                         (string-append pth "/lib")))
-                                   (else
-                                    #f)))
-                                '("cairo"
-                                  "fontconfig"
-                                  "glib"
-                                  "glu"
-                                  "gmp"
-                                  "gtk+"
-                                  "libjpeg"
-                                  "libpng"
-                                  "libx11"
-                                  "mesa"
-                                  "mpfr"
-                                  "openssl"
-                                  "pango"
-                                  "sqlite"
-                                  "unixodbc"
-                                  "libedit")))
-             #t)))
-       ;; Tests are in packages like racket-test-core and
-       ;; main-distribution-test that aren't part of the main distribution.
-       #:tests? #f))
+         (add-before 'configure 'change-directory
+           (lambda _
+             (chdir "racket/src")
+             #t))
+         (add-after 'install 'remove-pkgs-directory
+           ;; If the configured pkgs-dir exists, "pkgs.rktd" does not
+           ;; exist, and a lock file does not exist, commands like
+           ;; `raco pkg show` will try to create a lock file and fail
+           ;; due to the read-only store.
+           ;; Arguably this may be a bug in `pkg/private/lock`:
+           ;; see <https://github.com/racket/racket/issues/3851>.
+           ;; As a workaround, remove the directory.
+           (lambda* (#:key outputs #:allow-other-keys)
+             ;; rmdir because we want an error if it isn't empty
+             (rmdir (string-append (assoc-ref outputs "out")
+                                   "/share/racket/pkgs"))
+             #t)))))
+    (home-page "https://racket-lang.org")
+    (synopsis "Racket without bundled packages such as DrRacket")
     (description
      "Racket is a general-purpose programming language in the Scheme family,
 with a large set of libraries and a compiler based on Chez Scheme.  Racket is
@@ -167,7 +248,164 @@ The ``minimal Racket'' distribution includes just enough of Racket for you to
 use @command{raco pkg} to install more.  Bundled packages, such as the
 DrRacket IDE, are not included.")
     ;; https://download.racket-lang.org/license.html
-    (license (list lgpl3+ asl2.0 expat))))
+    ;; The LGPL components are only used by Racket BC.
+    (license (list asl2.0 expat))))
+
+
+(define-public racket-minimal-bc-3m
+  (hidden-package
+   (package
+     (inherit racket-minimal)
+     (name "racket-minimal-bc-3m")
+     (inputs
+      `(("libffi" ,libffi) ;; <- only for BC variants
+        ,@(fold alist-delete
+                (package-inputs racket-minimal)
+                '("zlib" "zlib:static" "lz4" "lz4:static"))))
+     (native-inputs
+      `(("libtool" ,libtool)
+        ("racket" ,(if (%current-target-system)
+                       racket-minimal
+                       racket-minimal-bc-cgc))))
+     (arguments
+      (substitute-keyword-arguments (package-arguments racket-minimal)
+        ((#:configure-flags _ '())
+         `(list "--enable-bconly"
+                ,cfg-flag:enable-racket
+                ,cfg-flag:enable-lt
+                ,cfg-flag:sh-for-rktio))
+        ((#:phases usual-phases)
+         `(modify-phases ,usual-phases
+            (delete 'unpack-nanopass+stex)
+            (delete 'unpack-bootfiles)))))
+     (synopsis "Minimal Racket with the BC [3M] runtime system")
+     (description "The Racket BC (``before Chez'' or ``bytecode'')
+implementation was the default before Racket 8.0.  It uses a compiler written
+in C targeting architecture-independent bytecode, plus a JIT compiler on most
+platforms.  Racket BC has a different C API and supports a slightly different
+set of architectures than the current default runtime system, Racket CS (based
+on ``Chez Scheme'').
+
+This package is the normal implementation of Racket BC with a precise garbage
+collector, 3M (``Moving Memory Manager'').")
+     ;; https://download.racket-lang.org/license.html
+     ;; The LGPL components are only used by Racket BC.
+     (license (list lgpl3+ asl2.0 expat)))))
+
+
+(define-public racket-minimal-bc-cgc
+  (package
+    (inherit racket-minimal-bc-3m)
+    (name "racket-minimal-bc-cgc")
+    (native-inputs
+     (alist-delete "racket" (package-native-inputs racket-minimal-bc-3m)))
+    (arguments
+     (substitute-keyword-arguments (package-arguments racket-minimal-bc-3m)
+       ((#:configure-flags _ '())
+        `(list "--enable-cgcdefault"
+               ,cfg-flag:enable-lt
+               ,cfg-flag:sh-for-rktio))))
+    (synopsis "Old Racket implementation used for bootstrapping")
+    (description "This variant of the Racket BC (``before Chez'' or
+``bytecode'') implementation is not recommended for general use.  It uses
+CGC (a ``Conservative Garbage Collector''), which was succeeded as default in
+PLT Scheme version 370 (which translates to 3.7 in the current versioning
+scheme) by the 3M variant, which in turn was succeeded in version 8.0 by the
+Racket CS implementation.
+
+Racket BC [CGC] is primarily used for bootstrapping Racket BC [3M].  It may
+also be used for embedding applications without the annotations needed in C
+code to use the 3M garbage collector.")))
+
+
+(define-public racket-bootstrap-chez-bootfiles
+  (hidden-package
+   (package
+     (inherit racket-minimal)
+     (name "racket-bootstrap-chez-bootfiles")
+     (inputs `())
+     (native-inputs
+      `(("racket" ,(if (%current-target-system)
+                       racket-minimal
+                       racket-minimal-bc-3m))
+        ("stex" ,@(assoc-ref (package-native-inputs chez-scheme) "stex"))
+        ("nanopass" ,@(assoc-ref (package-native-inputs chez-scheme)
+                                 "nanopass"))))
+     (arguments
+      `(#:phases
+        (modify-phases %standard-phases
+          (add-after 'unpack 'unpack-nanopass+stex
+            (lambda* (#:key inputs native-inputs #:allow-other-keys)
+              (with-directory-excursion "racket/src/ChezScheme"
+                ,unpack-nanopass+stex)
+              #t))
+          (delete 'configure)
+          (delete 'patch-generated-file-shebangs)
+          (replace 'build
+            (lambda* (#:key inputs outputs #:allow-other-keys)
+              (with-directory-excursion "racket/src/ChezScheme"
+                (invoke (string-append (assoc-ref inputs "racket")
+                                       "/bin/racket")
+                        "rktboot/main.rkt"
+                        "--dest" (assoc-ref outputs "out")))
+              #t))
+          (delete 'check)
+          (delete 'install))))
+     (synopsis "Chez Scheme bootfiles bootstrapped by Racket")
+     (description "Chez Scheme is a self-hosting compiler: building it
+requires ``bootfiles'' containing the Scheme-implemented portions compiled for
+the current platform.  (Chez can then cross-compile bootfiles for all other
+supported platforms.)
+
+The Racket package @code{cs-bootstrap} (part of the main Racket Git
+repository) implements enough of a Chez Scheme simulation to load the Chez
+Scheme compiler purely from source into Racket and apply the compiler to
+itself, thus bootstrapping Chez Scheme.  Bootstrapping takes about 10 times as
+long as using an existing Chez Scheme, but @code{cs-bootstrap} supports Racket
+7.1 and later, including the Racket BC variant.
+
+Note that the generated bootfiles are specific to Racket's fork of Chez
+Scheme, and @code{cs-bootstrap} does not currently support building upstream
+Chez Scheme.")
+     (license (list asl2.0)))))
+
+
+(define %installer-mirrors
+  ;; Source:
+  ;; https://github.com/racket/racket-lang-org/blob/master/download/data.rkt#L58
+  ;; Matthew Flatt says: "note that many are commented out"
+  ;; INVARIANT: End with a trailing "/"!
+  '("https://mirror.racket-lang.org/installers/"
+    "https://www.cs.utah.edu/plt/installers/"
+    "https://plt.cs.northwestern.edu/racket-mirror/"
+    "https://mirror.csclub.uwaterloo.ca/racket/racket-installers/"
+    ;; Universität Tübingen is using a self-signed HTTPS certificate:
+    "http://mirror.informatik.uni-tuebingen.de/mirror/racket/"
+    "https://racket.infogroep.be/"
+    ))
+
+(define %main-repo-main-distribution-pkgs
+  ;; These are the packages developed in the main Racket Git repository
+  ;; that are part of the main distribution.
+  '("at-exp-lib"
+    "base"
+    "compiler-lib"
+    ;; NOT "compiler-test"
+    "compiler"
+    "net-doc"
+    "net-lib"
+    ;; NOT "net-test"
+    "net"
+    ;; NOT "plt-services"
+    ;; NOT "racket-benchmarks"
+    ;; NOT "racket-build-guide"
+    "racket-doc"
+    "racket-index"
+    "racket-lib"
+    ;; NOT "racket-test-core"
+    ;; NOT "racket-test-extra"
+    ;; NOT "racket-test"
+    "zo-lib"))
 
 
 (define-public racket
@@ -177,7 +415,7 @@ DrRacket IDE, are not included.")
     (version (package-version racket-minimal)) ; needed for origin uri to work
     (source
      (origin
-       (inherit (package-source racket-minimal))
+       (method url-fetch)
        (uri (map (lambda (base)
                    (string-append base version "/racket-src.tgz"))
                  %installer-mirrors))
@@ -200,36 +438,10 @@ DrRacket IDE, are not included.")
                           "README"
                           "src"))
               ;; unbundle package sources included elsewhere
-              (define (substitute/delete file pattern)
-                (substitute
-                 file
-                 (list (cons pattern
-                             (lambda (line matches)
-                               ;; must match exactly once
-                               (match matches
-                                 ((m)
-                                  (string-append (match:prefix m)
-                                                 (match:suffix m)))))))))
-              (define (unbundle-pkg pkg)
-                (define quoted-pkg (regexp-quote pkg))
-                (with-directory-excursion "share"
-                  (substitute/delete
-                   "links.rktd"
-                   (string-append
-                    "[(][^()]+[(]#\"pkgs\" #\""
-                    quoted-pkg
-                    "\"[)][)]"))
-                  (with-directory-excursion "pkgs"
-                    (substitute/delete
-                     "pkgs.rktd"
-                     (string-append
-                      "[(]\""
-                      quoted-pkg
-                      "\" \\. #s[(]"
-                      "(pkg-info|[(]sc-pkg-info pkg-info 3[)])"
-                      " [(][^()]+[)] [^()]+[)][)]"))
-                    (delete-file-recursively pkg))))
-              (unbundle-pkg "racket-lib"))))))
+              (with-directory-excursion "share/pkgs"
+                (for-each delete-file-recursively
+                          '#+%main-repo-main-distribution-pkgs))
+              #t)))))
     (inputs
      `(("cairo" ,cairo)
        ("fontconfig" ,fontconfig)
@@ -247,22 +459,32 @@ DrRacket IDE, are not included.")
        ("libedit" ,libedit)))
     (native-inputs
      `(("racket" ,racket-minimal)
-       ("extend-layer" ,extend-layer)))
+       ("extend-layer" ,extend-layer)
+       ("main-repo" ,(package-source racket-minimal))))
     (arguments
      `(#:phases
        (modify-phases %standard-phases
          (add-before 'configure 'unpack-packages
-           (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
-             (let ((racket (assoc-ref (or native-inputs inputs) "racket"))
-                   (prefix (assoc-ref outputs "out")))
-               (mkdir-p (string-append prefix "/share/racket/pkgs"))
-               (copy-recursively
-                "share/links.rktd"
-                (string-append prefix "/share/racket/links.rktd"))
-               (copy-recursively
-                "share/pkgs"
-                (string-append prefix "/share/racket/pkgs"))
-               #t)))
+           (let ((unpack (assoc-ref %standard-phases 'unpack)))
+             (lambda* (#:key  native-inputs inputs outputs #:allow-other-keys)
+               (let* ((racket (assoc-ref (or native-inputs inputs) "racket"))
+                      (prefix (assoc-ref outputs "out"))
+                      (pkgs-dir (string-append prefix "/share/racket/pkgs")))
+                 (mkdir-p pkgs-dir)
+                 (copy-recursively
+                  "share/links.rktd"
+                  (string-append prefix "/share/racket/links.rktd"))
+                 (copy-recursively "share/pkgs" pkgs-dir)
+                 ;; NOTE: unpack changes the working directory
+                 (unpack #:source (assoc-ref (or native-inputs inputs)
+                                             "main-repo"))
+                 (for-each (lambda (pkg)
+                             (define dest (string-append pkgs-dir "/" pkg))
+                             (mkdir-p dest)
+                             (copy-recursively (string-append "pkgs/" pkg)
+                                               dest))
+                           ',%main-repo-main-distribution-pkgs)
+                 #t))))
          (replace 'configure
            (lambda* (#:key native-inputs inputs outputs #:allow-other-keys)
              (let ((racket (assoc-ref (or native-inputs inputs) "racket"))
