View the most recent changes for the jruby port at: jruby.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for jruby.
The raw portfile for jruby 1.3.1 is located here:
http://jruby.darwinports.com/dports/lang/jruby/Portfile
Find related portfiles with the unique DarwinPorts.com search feature.
Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/jruby

The jruby Portfile 52771 2009-06-23 01:48:24Z jmr macports.org $

PortSystem 1.0

Name: jruby
Version: 1.3.1

Category: lang ruby
Maintainers: gmail.com:ameingast
Platform: darwin

Description: JRuby is an 100% pure-Java implementation of the Ruby programming language.
Long Description: JRuby provides a complete set of core "builtin" classes and syntax for the Ruby language, as well as most of the Ruby Standard Libraries. The standard libraries are mostly Ruby's own complement of .rb files, but a few that depend on C language-based extensions have been reimplemented.
Homepage: http://jruby.codehaus.org/

Master Sites: http://dist.codehaus.org/jruby/${version}/
distname ${name}-src-${version}
worksrcdir ${name}-${version}
use_bzip2 no
Checksums: md5 c7e2aa4a3065db445a8b3e17ecff9fe0 sha1 e4de71e5c01f71f236b3135e07a5841784767fd8 rmd160 ef10395dbdf9490820caa65ff6236dd99e7c62c8

depends_build bin:ant:apache-ant
depends_lib bin:java:kaffe

use_configure no
universal_variant no

build.cmd ant
build.target jar

Variant: apidocs description "include API documentation" {
build.target jar create-apidocs
}

Variant: default_ruby description "build without j prefix" {

}

destroot {
# Create the target java directory exists
xinstall -m 755 -d ${destroot}${prefix}/share/java/${name}

# Copy over the needed elements of our directory tree
file copy ${worksrcpath}/bin ${worksrcpath}/lib ${destroot}${prefix}/share/java/${name}

if { [variant_isset apidocs] } {
file copy ${worksrcpath}/docs ${destroot}${prefix}/share/java/${name}
}

# Remove extraneous bat files
foreach f [glob -directory ${destroot}${prefix}/share/java/${name}/bin *.bat] {
file delete $f
}

set jruby_prefix ""

if { ![variant_isset default_ruby] } {
set jruby_prefix "j"
}

foreach f { jruby jirb jrubyc jrubcli jrubysrv } {
regsub {^j} $f $jruby_prefix dest
if { ${dest} != ${f} } {
ln -s ${prefix}/share/java/${name}/bin/${f} ${destroot}${prefix}/bin/${dest}
}
ln -s ${prefix}/share/java/${name}/bin/${f} ${destroot}${prefix}/bin/
}

foreach f { gem gem_mirror gemri gemwhich rake spec testrb } {
ln -s ${prefix}/share/java/${name}/bin/${f} ${destroot}${prefix}/bin/${jruby_prefix}${f}
}
}

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

--->  Staging jruby into destroot

--->  Installing jruby

- 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 jruby with these commands:

%  man jruby
%  apropos jruby
%  which jruby
%  locate jruby

 Where to find more information: