put the new Audio stuff to be a maintener stuff (--enable-maintener)

libs/portaudio/Makefile.am

 noinst_LTLIBRARIES = libportaudio.la
-libportaudio_la_CFLAGS = $(PORTAUDIO_CFLAGS) 
+libportaudio_la_CFLAGS = $(PORTAUDIO_CFLAGS)  -Ipa_common/ 
 libportaudio_la_LIBADD = $(PORTAUDIO_LIBS)
 libportaudio_la_CXXFLAGS = $(PORTAUDIO_CXXFLAGS)
-libportaudio_la_CPPFLAGS = $(PORTAUDIO_CPPFLAGS) 
+libportaudio_la_CPPFLAGS = $(PORTAUDIO_CPPFLAGS)
 
 
 if ENABLE_OSS