View the most recent changes for the bison port at: bison.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for bison.
The raw portfile for bison 2.4.1 is located here:
http://bison.darwinports.com/dports/devel/bison/Portfile
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The bison Portfile 57375 2009-09-10 08:16:41Z ryandesign macports.org $

PortSystem 1.0

Name: bison
Version: 2.4.1
Category: devel
Maintainers: mww
license GPLv3
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/
Platform: darwin
Master Sites: gnu
Checksums: md5 84e80a2a192c1a4c02d43fbf2bcc4ca4 sha1 fc96b28ee4a6a914b18cb1eddb68177d94b83361 rmd160 d194a6e0f586cab2aab137d215d0138336be367c
use_bzip2 yes

depends_lib port:gettext port:m4 port:libiconv

configure.args --infodir=${prefix}/share/info --mandir=${prefix}/share/man --disable-yacc

test.run yes
test.target check

post-destroot {
set docdir ${prefix}/share/doc/${name}
xinstall -d ${destroot}${docdir}/examples/calc++
xinstall -m 0444 -W ${worksrcpath} AUTHORS COPYING ChangeLog NEWS THANKS TODO ${destroot}${docdir}
xinstall -m 444 -W ${worksrcpath}/examples/calc++ calc++-driver.cc calc++-driver.hh calc++-parser.cc calc++-parser.hh calc++-parser.stamp calc++-parser.yy calc++-scanner.cc calc++-scanner.ll calc++.cc location.hh position.hh stack.hh test ${destroot}${docdir}/examples/calc++
delete ${destroot}${prefix}/lib/charset.alias
# yacc manpage gets installed even with '--disable-yacc'
if {! [variant_isset yacc]} {
delete ${destroot}${prefix}/share/man/man1/yacc.1
}
}

livecheck.type regex
livecheck.url http://ftp.gnu.org/gnu/bison/?C=M&O=D
livecheck.regex ${name}-(\\d+(?:\\.\\d+)*)

Variant: yacc description "enable yacc compatibility" {
configure.args-delete --disable-yacc
}

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

--->  Staging bison into destroot

--->  Installing bison

- 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 bison with these commands:

%  man bison
%  apropos bison
%  which bison
%  locate bison

 Where to find more information: