diff --git a/gnu/packages/firmware.scm b/gnu/packages/firmware.scm
index 828bc7402a..21df5cd8f2 100644
--- a/gnu/packages/firmware.scm
+++ b/gnu/packages/firmware.scm
@@ -1503,14 +1503,16 @@ having to run @command{qmk} as root when flashing the firmware.")
 (define* (make-qmk-firmware/implementation keyboard keymap
                                            #:key (description "")
                                            keymap-json
-                                           keymap-source-directory)
+                                           keymap-source-directory
+                                           keyboard-source-directory)
   "Return a package to build the QMK firmware for KEYBOARD with KEYMAP.
-Keyboard should be the name of a sub-directory under the @file{keyboards}
-directory.  For custom keymaps, KEYMAP-JSON, a file-like object of a JSON
-representation of KEYMAP as generated by the @url{https://config.qmk.fm/, QMK
-Configurator} tool or KEYMAP-SOURCE-DIRECTORY, a file-like object directory
-containing the keymap source files files such as @file{keymap.c}, can be
-provided."
+Keyboard should be the name of a sub-directory under the @file{keyboards} directory.
+For custom keymaps, KEYMAP-JSON, a file-like object of a JSON representation of
+KEYMAP as generated by the @url{https://config.qmk.fm/, QMK Configurator} tool or
+KEYMAP-SOURCE-DIRECTORY, a file-like object directory containing the keymap source
+files files such as @file{keymap.c}, can be provided.  For keyboards not available in
+upstream repository, provide a file-like object directory containing the whole
+keyboard definition in KEYBOARD-SOURCE-DIRECTORY."
   (package
     (name (string-append "qmk-firmware-"
                          (string-replace-substring keyboard "_" "-") "-"
@@ -1570,6 +1572,15 @@ provided."
                       (base32
                        "1rmhm4rxvq8skxqn6vc4n4ly1ak6whj7c386zbsci4pxx548n9h4"))))
                "lib/lufa")))
+          #$@(if keyboard-source-directory
+                 #~((add-after 'unpack 'copy-keyboard-source-directory
+                      (lambda _
+                        (let ((keyboard-dir #$(string-append "keyboards/" keyboard)))
+                          (false-if-exception (delete-file-recursively
+                                               keyboard-dir))
+                          (copy-recursively #$keyboard-source-directory
+                                            keyboard-dir)))))
+                 #~())
           #$@(if keymap-source-directory
                  #~((add-after 'unpack 'copy-keymap-source-directory
                       (lambda _