package/libpjsip: add sound support

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libpjsip/libpjsip.mk

@@ -25,7 +25,6 @@ LIBPJSIP_CONF_ENV = \
 	CFLAGS="$(LIBPJSIP_CFLAGS)"
 
 LIBPJSIP_CONF_OPTS = \
-	--disable-sound \
 	--disable-resample \
 	--disable-video \
 	--disable-g7221-codec \
@@ -49,6 +48,13 @@ LIBPJSIP_CONF_OPTS = \
 # so we want to use it.
 LIBPJSIP_CONF_OPTS += --enable-epoll
 
+ifeq ($(BR2_PACKAGE_ALSA_LIB_MIXER),y)
+LIBPJSIP_DEPENDENCIES += alsa-lib
+LIBPJSIP_CONF_OPTS += --enable-sound
+else
+LIBPJSIP_CONF_OPTS += --disable-sound
+endif
+
 ifeq ($(BR2_PACKAGE_BCG729),y)
 LIBPJSIP_DEPENDENCIES += bcg729
 LIBPJSIP_CONF_OPTS += --with-bcg729=$(STAGING_DIR)/usr