Installing maxima on MacOS-X Leopard

[MacBook pro Intel, MacOS-X 10.5]
I fail to install maxima following the suggestions of :

http://maxima.darwinports.com/

I can install darwinports but then :

%  cd /opt/local/bin/portslocation/dports/maxima   # those  
directories do not exist !
%  sudo port install maxima

fails with errors when installing sbcl.

I notice that binaries are available for Windows. Should I abandon my  
Unix machine (Mac) for a superior Windows machine to run Maxima ?

Thanks for the rest of us,

    -jpr