View the most recent changes for the libao port at: libao.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for libao.
The raw portfile for libao 0.8.8 is located here:
http://libao.darwinports.com/dports/audio/libao/Portfile
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# $Id: Portfile 34905 2008-03-10 20:48:27Z yves macports.org $

PortSystem 1.0

Name: libao
Version: 0.8.8
revision 2
Category: audio
Maintainers: nomaintainer
Description: A Cross-platform Audio Library
Long Description: libao is a way to easily add cross-platform audio output to your program. Output devices are implemented as dynamic plugins, and support for OSS, ESD, ALSA, aRTs, Solaris, and Irix outputs are currently supported.
Homepage: http://www.xiph.org/ao/
Platform: darwin
master_sites http://downloads.xiph.org/releases/ao/
checksums md5 b92cba3cbcf1ee9bc221118a85d23dcd

patchfiles patch-AU-configure patch-AU-src__plugins__macosx__ao_macosx.c
post-patch {
reinplace "s|/etc/libao.conf|${prefix}/etc/libao.conf|" ${worksrcpath}/CHANGES ${worksrcpath}/doc/config.html ${worksrcpath}/libao.conf.5 ${worksrcpath}/src/ao_private.h }

configure.args --disable-arts --disable-esd --disable-oss --disable-X

post-destroot {
if [variant_isset darwin] {
system "echo default_driver=macosx >> ${destroot}${prefix}/etc/libao.conf"
}
}

platform darwin 6 {
depends_lib-append lib:libdl:dlcompat
}

platform darwin {
}

Variant: esd {
depends_lib-append lib:libesd.0:esound
configure.args-delete --disable-esd
configure.args-append --enable-esd
}

livecheck.check regex
livecheck.url ${master_sites}?C=M&O=D
livecheck.regex ${name}-(\\d+(?:\\.\\d+)*)

If you haven't already installed Darwin Ports, you can find easy instructions for doing so at the main Darwin Ports page.
Once Darwin Ports has been installed, in a terminal window and while online, type the following and hit return:

%  cd /opt/local/bin/portslocation/dports/libao
%  sudo port install libao  
Password: 

You will then be prompted for your root password, which you should enter. You may have to wait for a few minutes while the software is retrieved from the network and installed for you. Y ou should see something that looks similar to:

--->  Fetching libao
--->  Verifying checksum for libao
--->  Extracting libao
--->  Configuring libao
--->  Building libao with target all

--->  Staging libao into destroot

--->  Installing libao

- Make sure that you do not close the terminal window while Darwin Ports is working. Once the software has been installed, you can find further information about using libao with these commands:

%  man libao
%  apropos libao
%  which libao
%  locate libao

 Where to find more information: