libao: add pulseaudio and sndio options.

srcpkgs/libao/template

@@ -1,11 +1,13 @@
 # Template file for 'libao'
 pkgname=libao
 version=1.2.0
-revision=1
+revision=2
 build_style=gnu-configure
 configure_args="--enable-alsa-mmap"
 hostmakedepends="pkg-config"
-makedepends="alsa-lib-devel pulseaudio-devel"
+makedepends="alsa-lib-devel
+ $(vopt_if pulseaudio pulseaudio-devel)
+ $(vopt_if sndio sndio-devel)"
 conf_files="/etc/libao.conf"
 homepage="http://xiph.org/ao/"
 short_desc="Cross-platform audio output library"
@@ -14,6 +16,9 @@ license="GPL-2"
 distfiles="http://downloads.xiph.org/releases/ao/${pkgname}-${version}.tar.gz"
 checksum=03ad231ad1f9d64b52474392d63c31197b0bc7bd416e58b1c10a329a5ed89caf
 
+build_options="pulseaudio sndio"
+build_options_default="pulseaudio"
+
 post_install() {
 	vconf ${FILESDIR}/libao.conf
 }