gnu: Add carla-2.6.

* gnu/packages/audio.scm (carla-2.6): New variable.

gnu/packages/audio.scm

@@ -11,7 +11,7 @@
 ;;; Copyright © 2016–2023 Tobias Geerinckx-Rice <me@tobias.gr>
 ;;; Copyright © 2018, 2020 Oleg Pykhalov <go.wigust@gmail.com>
 ;;; Copyright © 2018 okapi <okapi@firemail.cc>
-;;; Copyright © 2018, 2020, 2022 Maxim Cournoyer <maxim.cournoyer@gmail.com>
+;;; Copyright © 2018, 2020, 2022, 2023 Maxim Cournoyer <maxim.cournoyer@gmail.com>
 ;;; Copyright © 2018 Clément Lassieur <clement@lassieur.org>
 ;;; Copyright © 2018 Brett Gilio <brettg@gnu.org>
 ;;; Copyright © 2018, 2019, 2022 Marius Bakke <marius@gnu.org>
@@ -5562,6 +5562,25 @@ (define-public carla
 default and preferred audio driver but also supports native drivers like ALSA.")
     (license license:gpl2+)))
 
+;;; This package variant tracks the latest in-development 2.6 release.
+(define-public carla-2.6
+  (let ((commit "aa400535b31c67f4b6c1b28e6e20e4d4f82111a3")
+        (revision "0"))
+    (package
+      (inherit carla)
+      (name "carla")
+      (version (git-version "2.6.0" revision commit))
+      (source
+       (origin
+         (method git-fetch)
+         (uri
+          (git-reference
+           (url "https://github.com/falkTX/Carla")
+           (commit commit)))
+         (file-name (git-file-name name version))
+         (sha256
+          (base32 "0cnj2sgr60f5h6wdfmihc214wf3n74686sipl3iyzmylqrcyhbjn")))))))
+
 (define-public ecasound
   (package
     (name "ecasound")