autotools: support --with-pulseaudio to enable/disable pulseaudio

Makefile.am

 DATADIR=$(PREFIX)/share/espeak-data
 
 PLATFORM=big_endian
+AUDIO=@AUDIO@
 
 .PHONY: all clean distclean espeak-phoneme-data
 
 	cp $< $@
 
 src/libespeak.a: $(common_SOURCE) $(libespeak_SOURCE)
-	cd src && make libespeak.a PREFIX=$(PREFIX) && cd ..
+	cd src && make libespeak.a AUDIO=${AUDIO} PREFIX=$(PREFIX) && cd ..
 
 src/libespeak.so: $(common_SOURCE) $(libespeak_SOURCE)
-	cd src && make libespeak.so PREFIX=$(PREFIX) && cd ..
+	cd src && make libespeak.so AUDIO=${AUDIO} PREFIX=$(PREFIX) && cd ..
 
 src/speak: $(common_SOURCE) src/speak.cpp
-	cd src && make speak PREFIX=$(PREFIX) && cd ..
+	cd src && make speak AUDIO=${AUDIO} PREFIX=$(PREFIX) && cd ..
 
 src/espeak: src/libespeak.so src/espeak.cpp
-	cd src && make espeak PREFIX=$(PREFIX) && cd ..
+	cd src && make espeak AUDIO=${AUDIO} PREFIX=$(PREFIX) && cd ..
 
 src/espeakedit: $(common_SOURCE) $(libespeak_SOURCE) $(espeakedit_SOURCE)
-	cd src && make espeakedit PREFIX=$(PREFIX) && cd ..
+	cd src && make espeakedit AUDIO=${AUDIO} PREFIX=$(PREFIX) && cd ..
 
 espeak-phoneme-data:
 	cd platforms/$(PLATFORM) && make PREFIX=$(PREFIX) && cd ../..

configure.ac

 AC_CHECK_HEADERS([getopt.h])
 AC_CHECK_FUNCS([getopt_long])
 
+dnl ================================================================
+dnl PulseAudio checks.
+dnl ================================================================
+
+AC_ARG_WITH([pulseaudio],
+    [AS_HELP_STRING([--with-pulseaudio], [use the pulseaudio library for audio output @<:@default=yes@:>@])],
+    [])
+
+if test "$with_pulseaudio" = "no"; then
+    echo "Disabling pulseaudio output support via pulseaudio"
+    have_pulseaudio=no
+else
+    PKG_CHECK_MODULES(PULSEAUDIO, [libpulse >= 0.9],
+        [
+            have_pulseaudio=yes
+        ],[
+            have_pulseaudio=no
+        ])
+fi
+
+dnl ================================================================
+dnl Audio checks.
+dnl ================================================================
+
+if test "$have_pulseaudio" = yes ; then
+	AUDIO=pulseaudio
+else
+	AUDIO=disabled
+fi
+
+AC_SUBST(AUDIO)
+
 dnl ================================================================
 dnl Generate output.
 dnl ================================================================
     Configuration for eSpeak complete.
 
         Source code location:          ${srcdir}
-        XDG data location:             ${XDGDATADIR}
 
         Compiler:                      ${CXX}
         Compiler flags:                ${CXXFLAGS}
+
+	pulseaudio:                    ${have_pulseaudio}
+	audio configuration:           ${AUDIO}
 ])