View the most recent changes for the madplay port at: madplay.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for madplay.
The raw portfile for madplay 0.15.2b is located here:
http://madplay.darwinports.com/dports/audio/madplay/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/madplay

The madplay Portfile 58897 2009-10-07 01:41:45Z jmr macports.org $

PortSystem 1.0
Name: madplay
Version: 0.15.2b
Revision: 2
Category: audio
Maintainers: nomaintainer
Description: MPEG Audio Decoder
Long Description: MAD is a high-quality MPEG audio decoder. It currently supports MPEG-1 as well as the MPEG-2 extension to Lower Sampling Frequencies. All three audio layers (Layer I, Layer II, and Layer III a.k.a. MP3) are fully implemented.
Homepage: http://www.mars.org/home/rob/proj/mpeg/
Platform: darwin
Master Sites: ftp://ftp.mars.org/pub/mpeg/
Checksums: sha1 29105eb27c1416aa33c8d1ab3404a8e5f0aecd3f

Patch Files: patch-audio_carbon.c
configure.cflags-append -I${prefix}/include
configure.args --mandir=${prefix}/share/man --infodir=${prefix}/share/info

depends_lib port:libid3tag port:esound port:audiofile port:gettext port:libmad port:zlib

platform darwin i386 {
configure.cflags-append -msse
configure.args-append --build=${build_arch}-apple-darwin${os.major}
}

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/madplay
%  sudo port install madplay  
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 madplay
--->  Verifying checksum for madplay
--->  Extracting madplay
--->  Configuring madplay
--->  Building madplay with target all

--->  Staging madplay into destroot

--->  Installing madplay

- 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 madplay with these commands:

%  man madplay
%  apropos madplay
%  which madplay
%  locate madplay

 Where to find more information: