--- a/src/filter.c
+++ b/src/filter.c
@@ -45,6 +45,7 @@
#include "libprtX.h"
#include "optBase.h"
#include "linux_cmn.h"
+#include "xfifo.h"
#define WIDTH_BYTES(bits) (((bits) + 31) / 32 * 4)