Fix macOS build

ext/gstmoodbar/CMakeLists.txt

@@ -9,6 +9,7 @@ include_directories(${CMAKE_CURRENT_BINARY_DIR} ${CMAKE_CURRENT_SOURCE_DIR})
 include_directories(${GLIB_INCLUDE_DIRS})
 include_directories(${GOBJECT_INCLUDE_DIRS})
 include_directories(${GSTREAMER_INCLUDE_DIRS})
+include_directories(${GSTREAMER_AUDIO_INCLUDE_DIRS})
 include_directories(${FFTW3_INCLUDE_DIR})
 
 set(SOURCES gstfastspectrum.cpp gstmoodbarplugin.cpp)

ext/gstmoodbar/gstfastspectrum.cpp

@@ -22,6 +22,9 @@
 #include <cstring>
 #include <cmath>
 
+#include <gst/gst.h>
+#include <gst/audio/gstaudiofilter.h>
+
 #include <QMutex>
 #include <QMutexLocker>