View the most recent changes for the bison1 port at: bison1.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for bison1.
The raw portfile for bison1 1.875 is located here:
http://bison1.darwinports.com/dports/devel/bison1/Portfile
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The bison1 Portfile 33297 2008-01-23 09:32:47Z ryandesign macports.org $

PortSystem 1.0

Name: bison1
Version: 1.875
Category: devel lang
Platform: darwin
Maintainers: nomaintainer
Description: general-purpose parser generator
Long Description: Bison is a general-purpose parser generator that converts a grammar description for an LALR context-free grammar into a C program to parse that grammar. Once you are proficient with Bison, you can use it to develop a wide range of language parsers, from those used in simple desk calculators to complex programming languages.

Homepage: http://www.gnu.org/software/bison/
Master Sites: gnu:bison
distname bison-${version}
Checksums: md5 b7f8027b249ebd4dd0cc948943a71af0
use_bzip2 yes

configure.args --infodir=${prefix}/share/info --mandir=${prefix}/share/man --program-suffix=1 --datadir=${prefix}/share/${name} --libdir=${prefix}/lib/bison1 --without-libiconv-prefix --without-libintl-prefix

test.run yes
test.target check

post-destroot {
delete ${destroot}${prefix}/share/info
}

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/bison1
%  sudo port install bison1  
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 bison1
--->  Verifying checksum for bison1
--->  Extracting bison1
--->  Configuring bison1
--->  Building bison1 with target all

--->  Staging bison1 into destroot

--->  Installing bison1

- 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 bison1 with these commands:

%  man bison1
%  apropos bison1
%  which bison1
%  locate bison1

 Where to find more information: