View the most recent changes for the cbmbasic port at: cbmbasic.darwinports.com/diff
Scroll down toward the bottom of the page to get installation instructions for cbmbasic.
The raw portfile for cbmbasic 2 is located here:
http://cbmbasic.darwinports.com/dports/lang/cbmbasic/Portfile
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Check for any related Fink projects here: pdb.finkproject.org/pdb/package.php/cbmbasic

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

PortSystem 1.0

Name: cbmbasic
Version: 2
Revision: 20081028
Category: lang
Platform: darwin freebsd linux
Description: Commodore BASIC
Maintainers: afb
Long Description: This is a 100% compatible version of Commodore's version of Microsoft BASIC 6502 as found on the Commodore 64. You can use it in interactive mode or pass a BASIC file as a command line parameter.
Homepage: http://www.pagetable.com/?p=48
Master Sites: http://www.weihenstephan.org/~michaste/pagetable/recompiler/
distfiles cbmbasic.zip
Checksums: md5 ecd8cd832470ea85368c11d609274c31

use_zip yes
extract.mkdir yes

use_configure no
destroot {
copy ${worksrcpath}/cbmbasic ${destroot}${prefix}/bin/
}

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

--->  Staging cbmbasic into destroot

--->  Installing cbmbasic

- 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 cbmbasic with these commands:

%  man cbmbasic
%  apropos cbmbasic
%  which cbmbasic
%  locate cbmbasic

 Where to find more information: