View the most recent changes for the breqn port at: breqn.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for breqn.
The raw portfile for breqn 094 is located here:
http://breqn.darwinports.com/dports/tex/breqn/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/breqn

The breqn Portfile 50980 2009-05-14 19:41:55Z and.damore macports.org $

PortSystem 1.0
Name: breqn
Version: 094
Category: tex
Platform: darwin
Maintainers: gwright
Description: Automatic equation breaking in TeX.
Long Description: Automatic line breaking of displayed equations in TeX.

Homepage: http://www.ctan.org/tex-archive/help/Catalogue/entries/breqn.html
Master Sites: http://www.kilohotel.com/misc/ http://www.artfiles.org/gentoo.org/distfiles/ ftp://ftp.ams.org/pub/tex/
Checksums: md5 61f8bcbfd475203fd977ee9589810780

extract.suffix .tgz
distname ${name}${version}

depends_lib bin:texhash:texlive

configure { }
build { }

destroot { set breqndest ${destroot}${prefix}/share/texmf-local/tex/latex/${name}
file mkdir ${breqndest}
file copy ${worksrcpath}/breqn.sty ${breqndest}
file copy ${worksrcpath}/breqndoc.dvi ${breqndest}
file copy ${worksrcpath}/cmbase.sym ${breqndest}
file copy ${worksrcpath}/eqbreaks.dvi ${breqndest}
file copy ${worksrcpath}/eqlayouts.dvi ${breqndest}
file copy ${worksrcpath}/flexisym.sty ${breqndest}
file copy ${worksrcpath}/mathstyle.sty ${breqndest}
file copy ${worksrcpath}/msabm.sym ${breqndest}
}

post-activate { system "texhash" }

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

--->  Staging breqn into destroot

--->  Installing breqn

- 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 breqn with these commands:

%  man breqn
%  apropos breqn
%  which breqn
%  locate breqn

 Where to find more information: