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 @@

;;;

;;; 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")