Index: /trunk/src/VBox/Devices/Audio/DrvHostCoreAudio.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DrvHostCoreAudio.cpp	(revision 61320)
+++ /trunk/src/VBox/Devices/Audio/DrvHostCoreAudio.cpp	(revision 61321)
@@ -2169,4 +2169,15 @@
 
     return (PDMAUDIOSTRMSTS_FLAG_INITIALIZED | PDMAUDIOSTRMSTS_FLAG_ENABLED);
+}
+
+static DECLCALLBACK(int) drvHostCoreAudioStreamIterate(PPDMIHOSTAUDIO pInterface, PPDMAUDIOSTREAM pStream)
+{
+    AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
+    AssertPtrReturn(pStream,    VERR_INVALID_POINTER);
+
+    LogFlowFuncEnter();
+
+    /* Nothing to do here for Core Audio. */
+    return VINF_SUCCESS;
 }
 
Index: /trunk/src/VBox/Devices/Audio/DrvHostDSound.cpp
===================================================================
--- /trunk/src/VBox/Devices/Audio/DrvHostDSound.cpp	(revision 61320)
+++ /trunk/src/VBox/Devices/Audio/DrvHostDSound.cpp	(revision 61321)
@@ -2239,4 +2239,15 @@
 
     return strmSts;
+}
+
+static DECLCALLBACK(int) drvHostDSoundStreamIterate(PPDMIHOSTAUDIO pInterface, PPDMAUDIOSTREAM pStream)
+{
+    AssertPtrReturn(pInterface, VERR_INVALID_POINTER);
+    AssertPtrReturn(pStream,    VERR_INVALID_POINTER);
+
+    LogFlowFuncEnter();
+
+    /* Nothing to do here for DSound. */
+    return VINF_SUCCESS;
 }