I've fixed all the issues you mentioned: adopt meson build system, add GPTv2-only license in README, fix return values in code and a new description. Again, Thank you very much for your detailed guidance and patience.


 gnu/packages/xdisorg.scm | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/gnu/packages/xdisorg.scm b/gnu/packages/xdisorg.scm
index e5a98edb35..1c09128c17 100644
--- a/gnu/packages/xdisorg.scm
+++ b/gnu/packages/xdisorg.scm
@@ -54,6 +54,7 @@
 ;;; Copyright © 2021 jgart <jgart@dismail.de>
 ;;; Copyright © 2022 John Kehayias <john.kehayias@protonmail.com>
 ;;; Copyright © 2022 Jai Vetrivelan <jaivetrivelan@gmail.com>
+;;; Copyright © 2022 Derek Chuank <derekchuank@outlook.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1499,6 +1500,37 @@ (define-public redshift-wayland
 protocol.")
       (license license:gpl3+))))

+(define-public xwhite
+  (package
+   (name "xwhite")
+   (version "0.0.2")
+   (source
+    (origin
+     (method url-fetch)
+     (uri
+      (string-append "https://github.com/derekchuank/xwhite/"
+                     "releases/download/v" version
+                     "/xwhite-" version ".tar.gz"))
+     (sha256
+      (base32 "0jbnlj5a91ib4anprmylqqnbv9wa73cr7fsc1s54df0a0w5yq8sz"))))
+   (build-system meson-build-system)
+   (arguments
+    `(#:tests? #f)) ; No test suite.
+   (native-inputs
+    (list pkg-config))
+   (inputs
+    (list libxrandr))
+   (home-page "https://github.com/derekchuank/xwhite")
+   (synopsis "Adjust the color balance")
+   (description "@command{xwhite} is a command line tool for adjusting the colour
+balance of screen.  It is based on xrandr's gamma correction and brightness adjustment.
+As such, it can only be used for X displays and not Wayland displays.  It is typically
+used for tuning the color balance and color temperature.  It has a similar function as
+@command{redshift -P -g R:G:B -O temperature}, but @command{xwhite} is more flexible
+in that it does not keep the white color fixed, suitable for setting the white color
+to an arbitrary balanced color.")
+   (license license:gpl2)))
+
 (define-public gammastep
   (package
     (name "gammastep")