Index: abi/include/abi/fourcc.h
===================================================================
--- abi/include/abi/fourcc.h	(revision 8a637a47d260c9852eb7bbefc705cba01e8ef051)
+++ abi/include/abi/fourcc.h	(revision ed9bf14ea271bb6fd2ede343dbda94e25b021c6e)
@@ -36,4 +36,6 @@
 #define ABI_FOURCC_H_
 
+#include "../../../common.h"
+
 #define FOURCC(a, b, c, d) \
 	(((UINT32_T) (a)) | (((UINT32_T) (b)) << 8) | \
Index: abi/include/abi/ipc/interfaces.h
===================================================================
--- abi/include/abi/ipc/interfaces.h	(revision 8a637a47d260c9852eb7bbefc705cba01e8ef051)
+++ abi/include/abi/ipc/interfaces.h	(revision ed9bf14ea271bb6fd2ede343dbda94e25b021c6e)
@@ -174,5 +174,9 @@
 	    FOURCC_COMPACT('m', 'o', 'u', 's') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK,
 	INTERFACE_KBD_CB =
-	    FOURCC_COMPACT('k', 'b', 'd', ' ') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK
+	    FOURCC_COMPACT('k', 'b', 'd', ' ') | IFACE_EXCHANGE_SERIALIZE | IFACE_MOD_CALLBACK,
+	INTERFACE_VOL =
+	    FOURCC_COMPACT('v', 'o', 'l', ' ') | IFACE_EXCHANGE_SERIALIZE,
+	INTERFACE_VBD =
+	    FOURCC_COMPACT('v', 'b', 'd', ' ') | IFACE_EXCHANGE_SERIALIZE
 } iface_t;