nongnu: Add slack-desktop.

* nongnu/packages/messaging.scm: Add variable slack-desktop.

nongnu/packages/messaging.scm

@@ -20,6 +20,7 @@
   #:use-module (gnu packages linux)
   #:use-module (gnu packages nss)
   #:use-module (gnu packages pulseaudio)
+  #:use-module (gnu packages video)
   #:use-module (gnu packages xdisorg)
   #:use-module (gnu packages xml)
   #:use-module (gnu packages xorg)
@@ -405,3 +406,55 @@ or iOS.")
     (description "The Zoom video conferencing and messaging client.  Zoom must be run via an
 app launcher to use its .desktop file, or with @code{ZoomLauncher}.")
     (license (license:nonfree "https://explore.zoom.us/en/terms/"))))
+
+(define-public slack-desktop
+  (let ((binary-deps
+         '("ffmpeg" "dbus" ("nss" "/lib/nss") "cups" "libxcomposite" "gcc" "at-spi2-core"
+           "libxcb" "cairo" "nspr" "glibc" "libxfixes" "cups" "libx11" "glib"
+           "libxdamage" "libdrm" "libxrandr" "alsa-lib" "libxrandr" "expat" "pango"
+           ("out" "/lib/slack") "mesa" "libxkbcommon" "gtk+" "libxext")))
+    (package
+      (name "slack-desktop")
+      (version "4.39.90")
+      (source (origin
+                (method url-fetch)
+                (uri
+                 (string-append
+                  "https://downloads.slack-edge.com/desktop-releases/linux/x64/"
+                  version "/" name "-" version "-amd64.deb"))
+                (sha256
+                 (base32 "00ygbka304xnh99s17hh51lxjdkv2flh6nmn143dkj7qqabgrll8"))))
+      (build-system chromium-binary-build-system)
+      (arguments
+       (list
+        #:patchelf-plan
+        `'(("usr/bin/slack"  ,binary-deps)
+           ("usr/lib/slack/slack" ,binary-deps)
+           ("usr/lib/slack/libEGL.so" ("gcc"))
+           ("usr/lib/slack/chrome_crashpad_handler" ("gcc" "glibc"))
+           ("usr/lib/slack/libvk_swiftshader.so" ("gcc" "glibc"))
+           ("usr/lib/slack/libvulkan.so.1" ("gcc"))
+           ("usr/lib/slack/libffmpeg.so" ("gcc"))
+           ("usr/lib/slack/libGLESv2.so" ("libx11" "libxext" "libxext"
+                                          "libdrm" "gcc" "libxcb" "glibc")))
+        #:validate-runpath? #f
+        #:install-plan
+        `'(("usr/bin/slack" "bin/")
+           ("usr/lib/" "lib/")
+           ("usr/share/" "share/"))))
+
+      (inputs (list ffmpeg dbus nss cups libxcomposite libx11 libxext libxrandr
+                    libxfixes libxdamage libxcb glibc at-spi2-core cairo nspr
+                    libxkbcommon glib mesa gtk+ (list gcc "lib") libdrm alsa-lib expat))
+
+      (synopsis  "Slack communication system")
+      (supported-systems '("x86_64-linux"))
+      (description "Slack brings team communication and collaboration into one place so
+                   you can get more work done, whether you belong to a large enterprise
+                   or a small business. Check off your to-do list and move your projects
+                   forward by bringing the right people, conversations, tools, and
+                   information you need together. Slack is available on any device, so
+                   you can find and access your team and your work, whether you’re at
+                   your desk or on the go.")
+      (home-page "https://slack.com/")
+      (license (license:nonfree "Properietary license")))))