gnu: Add material-gtk-themes.

* gnu/packages/gnome-xyz.scm (material-gtk-themes): New variable.

Change-Id: I7078a2c4b4791f207bdc45080d1b180e1735c24a
Signed-off-by: Maxim Cournoyer <maxim@guixotic.coop>

gnu/packages/gnome-xyz.scm

@@ -28,6 +28,7 @@
 ;;; Copyright © 2025 Gabriel Santos <gabrielsantosdesouza@disroot.org>
 ;;; Copyright © 2025 Noé Lopez <noelopez@free.fr>
 ;;; Copyright © 2025 Trevor Arjeski <tmarjeski@gmail.com>
+;;; Copyright © 2026 Luis Guilherme Coelho <lgcoelho@disroot.org>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -1556,6 +1557,39 @@ desktop environments.  It supports GTK 2, GTK 3, GNOME Shell, Budgie,
 Cinnamon, MATE, Unity, Xfce, LightDM, GDM, Chrome theme, etc.")
     (license license:gpl2+)))
 
+(define-public material-gtk-themes
+  ;; No releases nor tags: use the latest commit available.
+  (let ((commit "55f4639ad6a9128f885305a60d230c5842711259")
+        (revision "0"))
+    (package
+      (name "material-gtk-themes")
+      (version (git-version "0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/Fausto-Korpsvart/Material-GTK-Themes")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "15483c2ca5q4q68dync9fja5kzahy508hsdmq42jc62ikwa5slk4"))))
+      (build-system copy-build-system)
+      (arguments
+       (list #:install-plan
+             #~'(("themes" "share/themes")
+                 ("icons" "share/icons"))))
+      (home-page "https://github.com/Fausto-Korpsvart/Material-GTK-Themes")
+      (synopsis "Material GTK Themes")
+      (description "This package provides GTK themes based on the following
+themes:
+@enumerate
+@item Material for Neovim by Marko Cerovac
+@item Graphite GTK by VinceLiuice
+@item Suru Plus Icon Theme by Gusbemacbe
+@end enumerate")
+      (license license:gpl3+))))
+
 (define-public numix-gtk-theme
   (package
     (name "numix-gtk-theme")