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-rw-r--r--src/modules/systemlib/mixer/mixer.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/modules/systemlib/mixer/mixer.cpp b/src/modules/systemlib/mixer/mixer.cpp
index b1bb1a66d..b4b82c539 100644
--- a/src/modules/systemlib/mixer/mixer.cpp
+++ b/src/modules/systemlib/mixer/mixer.cpp
@@ -50,6 +50,8 @@
#include <stdio.h>
#include <math.h>
#include <unistd.h>
+#include <ctype.h>
+#include <systemlib/err.h>
#include "mixer.h"