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-rw-r--r--backends/platform/sdl/sdl.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/backends/platform/sdl/sdl.cpp b/backends/platform/sdl/sdl.cpp
index 76ac91c282..d8394b5c9c 100644
--- a/backends/platform/sdl/sdl.cpp
+++ b/backends/platform/sdl/sdl.cpp
@@ -170,6 +170,10 @@ OSystem_SDL::OSystem_SDL()
_joystick(0),
_currentShakePos(0), _newShakePos(0),
_paletteDirtyStart(0), _paletteDirtyEnd(0),
+#ifdef MIXER_DOUBLE_BUFFERING
+ _soundMutex(0), _soundCond(0), _soundThread(0),
+ _soundThreadIsRunning(false), _soundThreadShouldQuit(false),
+#endif
_savefile(0),
_mixer(0),
_timer(0),