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-rw-r--r--mate-volume-control/src/mvc-helpers.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/mate-volume-control/src/mvc-helpers.h b/mate-volume-control/src/mvc-helpers.h
index 248c843..16e48db 100644
--- a/mate-volume-control/src/mvc-helpers.h
+++ b/mate-volume-control/src/mvc-helpers.h
@@ -31,6 +31,12 @@ const gchar *mvc_channel_position_to_string (MateMixerChannelPosition pos
const gchar *mvc_channel_position_to_pretty_string (MateMixerChannelPosition position);
const gchar *mvc_channel_map_to_pretty_string (MateMixerStream *stream);
+#if GTK_CHECK_VERSION (3, 0, 0)
+void mvc_color_shade (GdkRGBA *a,
+ GdkRGBA *b,
+ gdouble k);
+#endif
+
G_END_DECLS
#endif /* __MVC_HELPERS_H */