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diff --git a/third_party/build/portaudio/os-auto.mak.in b/third_party/build/portaudio/os-auto.mak.in
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+# @configure_input@
+
+# Define the desired sound device backend
+# Valid values are:
+# - pa_unix: PortAudio on Unix (OSS or ALSA)
+# - pa_darwinos: PortAudio on MacOSX (CoreAudio)
+# - pa_old_darwinos: PortAudio on MacOSX (old CoreAudio, for OSX 10.2)
+# - pa_win32: PortAudio on Win32 (WMME)
+#
+# There are other values below, but these are handled by PJMEDIA's Makefile
+# - ds: Win32 DirectSound (dsound.c)
+# - null: Null sound device (nullsound.c)
+AC_PJMEDIA_SND=@ac_pjmedia_snd@
+
+# For Unix, specify if ALSA should be supported
+AC_PA_USE_ALSA=@ac_pa_use_alsa@
+
+# Additional PortAudio CFLAGS are in @ac_pa_cflags@
+
+
+#
+# PortAudio on Unix
+#
+ifeq ($(AC_PJMEDIA_SND),pa_unix)
+# Host APIs and utils
+export PORTAUDIO_OBJS += pa_unix_hostapis.o pa_unix_util.o
+
+# Include ALSA?
+ifeq ($(AC_PA_USE_ALSA),1)
+export CFLAGS += -DPA_USE_ALSA=1
+export PORTAUDIO_OBJS += pa_linux_alsa.o
+endif
+
+export CFLAGS += -DPA_USE_OSS=1
+export CFLAGS += @ac_pa_cflags@
+export PORTAUDIO_OBJS += pa_unix_oss.o
+endif
+
+
+#
+# PortAudio on MacOS X (using current PortAudio)
+#
+ifeq ($(AC_PJMEDIA_SND),pa_darwinos)
+export PORTAUDIO_OBJS +=pa_mac_hostapis.o \
+ pa_unix_util.o \
+ pa_mac_core.o \
+ pa_mac_core_blocking.o \
+ pa_mac_core_utilities.o \
+ pa_ringbuffer.o
+export CFLAGS += -DPA_USE_COREAUDIO=1
+export CFLAGS += @ac_pa_cflags@
+endif
+
+#
+# PortAudio on MacOS X (using old PortAudio, for MacOS X 10.2.x)
+#
+ifeq ($(AC_PJMEDIA_SND),pa_old_darwinos)
+export PORTAUDIO_OBJS +=pa_mac_hostapis.o \
+ pa_unix_util.o \
+ pa_mac_core_old.o
+export CFLAGS += -DPA_USE_COREAUDIO=1
+export CFLAGS += @ac_pa_cflags@
+endif
+
+#
+#
+# PortAudio on Win32 (WMME)
+#
+ifeq ($(AC_PJMEDIA_SND),pa_win32)
+export PORTAUDIO_OBJS += pa_win_hostapis.o pa_win_util.o \
+ pa_win_wmme.o
+export CFLAGS += -DPA_NO_ASIO -DPA_NO_DS
+endif