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

The rb-opengl Portfile 38254 2008-07-13 22:16:28Z febeling macports.org $
PortSystem 1.0
PortGroup ruby 1.0

ruby.setup {opengl rbogl} 0.32g extconf.rb {sample}
Revision: 0
Maintainers: nomaintainer
Description: OpenGL bindings for Ruby
Long Description: ${description}
Category:-append graphics
Homepage: http://www2.giganet.net/~yoshi/
Master Sites: ${homepage}
Checksums: md5 0832d08a87ebb16f6d4e30459a5019f0
Platform: darwin

worksrcdir ${ruby.module}-${version}

Patch Files: patch-extconf.rb patch-glu.c patch-glut.c patch-ogl.c patch-rbogl.c

post-configure {
reinplace "s|^CFLAGS.*\$|& -I/System/Library/Frameworks/OpenGL.framework/Headers -I/System/Library/Frameworks/GLUT.framework/Headers|" Makefile.glut Makefile.ogl
reinplace "s|^DLDFLAGS.*\$|& -L\$(prefix)/lib -L/System/Library/Frameworks/OpenGL.framework/Libraries|" Makefile.glut Makefile.ogl
reinplace "s|^LIBS.*\$|& -lGLU -framework GLUT -lGL -framework OpenGL|" Makefile.glut Makefile.ogl
}

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

--->  Staging rb-opengl into destroot

--->  Installing rb-opengl

- 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 rb-opengl with these commands:

%  man rb-opengl
%  apropos rb-opengl
%  which rb-opengl
%  locate rb-opengl

 Where to find more information: