gnu: Add appmenu-gtk-module.

* gnu/packages/gtk.scm (appmenu-gtk-menu): New variable.

Co-authored-by: Marius Bakke <marius@gnu.org>

gnu/packages/gtk.scm

@@ -32,6 +32,7 @@
 ;;; Copyright © 2022 Zhu Zihao <all_but_last@163.com>
 ;;; Copyright © 2022 Benjamin Slade <slade@lambda-y.net>
 ;;; Copyright © 2022 Denis 'GNUtoo' Carikli <GNUtoo@cyberdimension.org>
+;;; Copyright © 2022 Petr Hodina <phodina@protonmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -117,6 +118,43 @@
   #:use-module (srfi srfi-26)
   #:use-module (ice-9 match))
 
+(define-public appmenu-gtk-module
+  (package
+    (name "appmenu-gtk-module")
+    (version "0.7.6")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://gitlab.com/vala-panel-project/vala-panel-appmenu")
+             (commit version)))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32
+         "1ywpygjwlbli65203ja2f8wwxh5gbavnfwcxwg25v061pcljaqmm"))))
+    (build-system meson-build-system)
+    (arguments
+     (list
+      #:glib-or-gtk? #t
+      #:phases
+      #~(modify-phases %standard-phases
+          (add-after 'unpack 'fix-install-gtk-module
+            (lambda* _
+              (substitute*
+                  "subprojects/appmenu-gtk-module/src/gtk-3.0/meson.build"
+                (("gtk3.get_pkgconfig_variable\\('libdir'\\)")
+                 #$output)))))))
+    (native-inputs
+     (list `(,glib "bin") vala pkg-config))
+    (inputs
+     (list gtk+ libwnck))
+    (synopsis "Application Menu applet")
+    (description
+     "This package provides a global menu applet for use with desktop panels
+such as mate-panel and xfce4-panel.")
+    (home-page "https://gitlab.com/vala-panel-project/vala-panel-appmenu")
+    (license (list license:lgpl3))))
+
 (define-public atk
   (package
     (name "atk")