need to install audio_manager.I

panda/src/audio/Sources.pp

@@ -23,7 +23,7 @@
     audio_sample.I audio_sample.h audio_trait.h audio_mikmod_traits.h \
     audio_win_traits.I audio_win_traits.h audio_null_traits.I \
     audio_null_traits.h audio_linux_traits.I audio_linux_traits.h \
-    audio_music.I config_audio.h
+    audio_music.I config_audio.h audio_manager.I
 
   #define IGATESCAN audio.h