gnu: Add granite-6.

* gnu/packages/pantheon.scm (granite-6): New variable.

Signed-off-by: Efraim Flashner <efraim@flashner.co.il>

gnu/packages/pantheon.scm

@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2020 Ryan Prior <rprior@protonmail.com>
 ;;; Copyright © 2023 Wamm K. D. <jaft.r@outlook.com>
+;;; Copyright © 2023 altadil <Altadil@protonmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -72,6 +73,22 @@ things, it provides complex widgets and convenience functions designed for use
 in apps built for the Pantheon desktop.")
     (license license:lgpl3+)))
 
+;; This is required for pantheon apps that have not been ported to GTK4 yet.
+(define-public granite-6
+  (package
+    (inherit granite)
+    (version "6.2.0")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/elementary/granite")
+                    (commit version)))
+              (file-name (git-file-name "granite" version))
+              (sha256
+               (base32
+                "0ilslmg63hh2x7h5rvs3mhzw1y9ixhhkqnn1j1lzwm12v2iidkaq"))))
+    (propagated-inputs (list glib libgee gtk+))))
+
 (define-public pantheon-calculator
   (package
     (name "pantheon-calculator")