gnu: Add emacs-next-pgtk.

* gnu/packages/emacs.scm (emacs-next-pgtk): New variable.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu/packages/emacs.scm

@@ -313,6 +313,38 @@ languages.")
               (variable "INFOPATH")
               (files '("share/info"))))))))
 
+(define-public emacs-next-pgtk
+  (let ((commit "3df4ca451d41a5f1036713277ef55ca9734c6fa7")
+        (revision "0"))
+    (package/inherit emacs-next
+      (name "emacs-next-pgtk")
+      (version (git-version "28.0.50" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri (git-reference
+               (url "https://github.com/masm11/emacs")
+               (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32
+           "1c677c97b9avhlzysg09cvf6bd69iz41ggppnszw8chhphk3knfc"))))
+      (arguments
+       (substitute-keyword-arguments (package-arguments emacs-next)
+         ((#:configure-flags flags ''())
+          `(cons* "--with-pgtk" "--with-xwidgets" ,flags))))
+      (propagated-inputs
+       `(("gsettings-desktop-schemas" ,gsettings-desktop-schemas)
+         ("glib-networking" ,glib-networking)))
+      (inputs
+       `(("webkitgtk" ,webkitgtk)
+         ,@(package-inputs emacs-next)))
+      (home-page "https://github.com/masm11/emacs")
+      (synopsis "Emacs text editor with @code{pgtk} and @code{xwidgets} support")
+      (description "This is an unofficial Emacs fork build with a pure-GTK
+graphical toolkit to work natively on Wayland.  In addition to that, xwidgets
+also enabled and works without glitches even on X server."))))
+
 (define-public emacs-minimal
   ;; This is the version that you should use as an input to packages that just
   ;; need to byte-compile .el files.