The package version is the same one used in nixpkgs (current tip).
Should I add some "unstable" string somewhere?  Also, I'm pretty sure
I overcomplicated things, there must be some easier way to patch the
executable paths.

* gnu/packages/graphics.scm (gpu-switch): New variable.
---
 gnu/packages/graphics.scm | 58 ++++++++++++++++++++++++++++++++++++++-
 1 file changed, 57 insertions(+), 1 deletion(-)

diff --git a/gnu/packages/graphics.scm b/gnu/packages/graphics.scm
index fe35aaad2d..d425a18c18 100644
--- a/gnu/packages/graphics.scm
+++ b/gnu/packages/graphics.scm
@@ -27,6 +27,7 @@
 ;;; Copyright © 2021 Andy Tai <atai@atai.org>
 ;;; Copyright © 2021 Ekaitz Zarraga <ekaitz@elenq.tech>
 ;;; Copyright © 2021 Vinicius Monego <monego@posteo.net>
+;;; Copyright © 2022 Jorge Acereda <jacereda@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -113,12 +114,14 @@ (define-module (gnu packages graphics)
   #:use-module (guix build-system meson)
   #:use-module (guix build-system python)
   #:use-module (guix build-system qt)
+  #:use-module (guix build-system trivial)
   #:use-module (guix download)
   #:use-module (guix git-download)
   #:use-module (guix hg-download)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (guix packages)
-  #:use-module (guix utils))
+  #:use-module (guix utils)
+  #:use-module (ice-9 match))
 
 (define-public mmm
   (package
@@ -2011,4 +2014,56 @@ (define-public monado
 such as VR and AR on mobile, PC/desktop, and any other device.  Monado aims to be
 a complete and conforming implementation of the OpenXR API made by Khronos.")
     (license license:boost1.0)))
 +
+(define-public gpu-switch
+  (package
+    (name "gpu-switch")
+    (version "2017-04-28")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/0xbb/gpu-switch")
+             (commit "a365f56d435c8ef84c4dd2ab935ede4992359e31")))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "1jnh43nijkqd83h7piq7225ixziggyzaalabgissyxdyz6szcn0r"))))
+    (build-system trivial-build-system)
+    (inputs
+     (list bash e2fsprogs util-linux grep coreutils which))
+    (arguments
+     `(#:modules ((guix build utils))
+       #:builder
+       (begin
+         (use-modules (guix build utils) (ice-9 match))
+         (let* ((out (assoc-ref %outputs "out"))
+                (gpu-switch (search-input-file %build-inputs "gpu-switch"))
+                (bin (string-append out "/bin"))
+                (out-gpu-switch (string-append bin "/gpu-switch"))
+                (readme (search-input-file %build-inputs "README.md")))
+           (install-file gpu-switch bin)
+           (for-each
+            (match-lambda
+              ((pkg . nm) (substitute* out-gpu-switch
+                            ((nm)
+                             (string-append (assoc-ref %build-inputs pkg)
+                                            "/bin/" nm)))))
+            '(("coreutils" . "basename")
+              ("bash" . "bash")
+              ("util-linux" . "mount")
+              ("which" . "which")
+              ("coreutils" . "cat")
+              ("e2fsprogs" . "chattr")
+              ("grep" . "grep")))
+           (install-file readme (string-append out "/share/doc/gpu-switch-" ,version))
+           #t))))
+    (home-page "https://github.com/0xbb/gpu-switch")
+    (synopsis "GPU switcher for dual-GPU MacBook Pro models")
+    (description
+     "Switch between the integrated and dedicated GPU of dual-GPU MacBook Pro
+models for the next reboot.
+
+It aims to remove the need of booting into OS X and running gfxCardStatus
+v2.2.1 to switch to the integrated card.")
+    (license license:expat)))
+
-- 
2.34.0