View the most recent changes for the unarj port at: unarj.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for unarj.
The raw portfile for unarj 2.63a is located here:
http://unarj.darwinports.com/dports/archivers/unarj/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/unarj

The unarj Portfile 57375 2009-09-10 08:16:41Z ryandesign macports.org $

PortSystem 1.0

Name: unarj
Version: 2.63a
Revision: 1
Category: archivers sysutils
Platform: darwin
Description: extract files from dos .arj archives
Maintainers: crazic.ru:jc

Long Description: ${description}

Homepage: http://ibiblio.org/pub/Linux/utils/compress/
Master Sites: ${homepage}

Checksums: md5 a83d139c245f911f22cb1b611ec9768f sha1 abd35d894444fea1a0bdc7472ed2346f0f8c6ba4 rmd160 cebee016ffc2b7eb74a13f8246d82ea68519e500

build.target unarj

configure {
reinplace -E "/^CFLAGS/s|-ansi -pedantic|[join ${configure.cflags} " "]|" ${worksrcpath}/Makefile
}

destroot.destdir INSTALLDIR=${destroot}${prefix}/bin

post-destroot {
set docdir ${prefix}/share/doc/${name}-${version}
xinstall -d ${destroot}${docdir}
xinstall -m 0644 ${worksrcpath}/unarj.txt ${destroot}${docdir}
}

livecheck.type regex
livecheck.url ${homepage}?C=M&O=D
livecheck.regex ${name}-(\\d+(?:\\.\\d+)*\[a-z\])

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

--->  Staging unarj into destroot

--->  Installing unarj

- 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 unarj with these commands:

%  man unarj
%  apropos unarj
%  which unarj
%  locate unarj

 Where to find more information: