I propose to make sound-theme-freedesktop a propagated input of
libcanberra. This is because, according to the XDG sound theme
specification, those event sounds should always be present and used as
fall-back in case other sounds are not present.

http://www.freedesktop.org/wiki/Specifications/sound-theme-spec/

Regards,
Fede
From 72daec908a2f790d73e332c680433734125c5eee Mon Sep 17 00:00:00 2001
From: Federico Beffa <be...@fbengineering.ch>
Date: Thu, 18 Dec 2014 21:32:34 +0100
Subject: [PATCH 3/4] gnu: libcanberra: Add propagated-input.

* gnu/packages/libcanberra.scm (libcanberra): Add 'sound-theme-freedesktop' as
  a propagated-input.
---
 gnu/packages/libcanberra.scm | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/gnu/packages/libcanberra.scm b/gnu/packages/libcanberra.scm
index 764c327..24a6a0b 100644
--- a/gnu/packages/libcanberra.scm
+++ b/gnu/packages/libcanberra.scm
@@ -58,6 +58,11 @@
        ("udev" ,eudev)))
     (native-inputs
      `(("pkg-config" ,pkg-config)))
+    ;; This is the default and fall-back sound theme for XDG desktips and
+    ;; should always be present.
+    ;; http://www.freedesktop.org/wiki/Specifications/sound-theme-spec/
+    (propagated-inputs
+     `(("sound-theme-freedesktop" ,sound-theme-freedesktop)))
     (home-page "http://0pointer.de/lennart/projects/libcanberra/";)
     (synopsis
      "Implementation of the XDG Sound Theme and Name Specifications")
-- 
1.8.4

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