diff -Naur a/src/AudioIOBase.cpp b/src/AudioIOBase.cpp
--- a/src/AudioIOBase.cpp	2020-06-19 15:16:47.000000000 +0000
+++ b/src/AudioIOBase.cpp	2020-08-04 19:43:27.985734707 +0000
@@ -21,6 +21,7 @@
 #include "prefs/RecordingPrefs.h"
 #include "widgets/MeterPanelBase.h"
 
+#include "portaudio.h"
 #if USE_PORTMIXER
 #include "portmixer.h"
 #endif