View the most recent changes for the avr-libc port at: avr-libc.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for avr-libc.
The raw portfile for avr-libc 1.6.1 is located here:
http://avr-libc.darwinports.com/dports/cross/avr-libc/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/avr-libc

The avr-libc Portfile 42376 2008-11-20 05:01:47Z blb macports.org $
PortSystem 1.0
Name: avr-libc
Version: 1.6.1
Category: cross
Maintainers: nomaintainer
Description: C library for the AVR microcontroller.
Long Description: AVR Libc is a Free Software project whose goal is to provide a high quality C library for use with GCC on Atmel AVR microcontrollers.
Platform: darwin
Homepage: http://www.nongnu.org/avr-libc/
Master Sites: http://savannah.nongnu.org/download/avr-libc/

use_bzip2 yes
Checksums: md5 22b822edcae196621482a5524dfd4bed sha1 24ad9f0636bbe1487d57894e3a45a6921674856d rmd160 2e347bb0e9d796038cd73762b7f69d906e47b21e

depends_lib port:gettext
depends_lib port:avr-gcc
depends_build port:binutils

configure.args --host=avr --build=`./config.guess`
configure.cc avr-gcc

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

--->  Staging avr-libc into destroot

--->  Installing avr-libc

- 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 avr-libc with these commands:

%  man avr-libc
%  apropos avr-libc
%  which avr-libc
%  locate avr-libc

 Where to find more information: