gnu: Add i3lock.

* gnu/packages/wm.scm (i3lock): New public variable.

gnu/packages/wm.scm

@@ -13,7 +13,7 @@
 ;;; Copyright © 2016 doncatnip <gnopap@gmail.com>
 ;;; Copyright © 2016 Ivan Vilata i Balaguer <ivan@selidor.net>
 ;;; Copyright © 2017 Mekeor Melire <mekeor.melire@gmail.com>
-;;; Copyright © 2017 Marius Bakke <mbakke@fastmail.com>
+;;; Copyright © 2017, 2019 Marius Bakke <mbakke@fastmail.com>
 ;;; Copyright © 2017 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2018, 2019 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018 Pierre-Antoine Rouby <contact@parouby.fr>
@@ -220,6 +220,36 @@ i3 uses a plain-text configuration file, and can be extended and controlled from
 many programming languages.")
     (license license:bsd-3)))
 
+(define-public i3lock
+  (package
+    (name "i3lock")
+    (version "2.11.1")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "https://i3wm.org/i3lock/i3lock-"
+                                  version ".tar.bz2"))
+              (sha256
+               (base32
+                "015dn534m7cxjvqdncpvaq9p8b2r4w5hp1yanbdy2abmhbcc7a7j"))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("pkg-config" ,pkg-config)))
+    (inputs
+     `(("cairo" ,cairo)
+       ("libev" ,libev)
+       ("linux-pam" ,linux-pam)
+       ("libxcb" ,libxcb)
+       ("libxkbcommon" ,libxkbcommon)
+       ("xcb-util" ,xcb-util)
+       ("xcb-util-image" ,xcb-util-image)
+       ("xcb-util-xrm" ,xcb-util-xrm)))
+    (home-page "https://i3wm.org/i3lock/")
+    (synopsis "Lightweight screen locker")
+    (description
+     "i3lock is a simple X11 screen locker developed alongside the i3 project.
+Despite the name it should work with any X11 window manager.")
+    (license license:bsd-3)))
+
 (define-public i3blocks
   (let ((commit "37f23805ff886639163fbef8aedba71c8071eff8")
         (revision "1"))