--- src/modules/rubberband/filter_rbpitch.cpp.orig	2020-12-31 11:47:05.000000000 -0800
+++ src/modules/rubberband/filter_rbpitch.cpp	2020-12-31 11:47:55.000000000 -0800
@@ -25,6 +25,7 @@
 #include <algorithm>
 #include <cstring>
 #include <math.h>
+#include <cstdlib>
 
 using namespace RubberBand;