--- espeak-1.48.04-source/src/Makefile

+++ espeak-1.48.04-source/src/Makefile

@@ -43,6 +43,11 @@ WAVE=wave_pulse.cpp

 LIB_AUDIO=-lpulse

 USE_AUDIO=-DUSE_PULSEAUDIO

 else

+ifeq ($(AUDIO),ao)

+WAVE=wave_ao.cpp

+LIB_AUDIO=-lao

+USE_AUDIO=-DUSE_AO

+else

 ifeq ($(AUDIO),portaudio)

 WAVE=wave.cpp

 LIB_AUDIO=-lportaudio

@@ -69,6 +74,7 @@ endif

 endif

 endif

 endif

+endif

 speak_SOURCES = speak.cpp compiledict.cpp dictionary.cpp intonation.cpp \

 	readclause.cpp setlengths.cpp numbers.cpp synth_mbrola.cpp \