Omegahat sjava

I am trying to download and install Omegahat Sjava 
(http://www.omegahat.org/RSJava) to be able to call R from within Java.

The install instructions are as follows:

cd $RHOME/src/library
   unzip SJava_0.69-0.zip
   cd SJava
   ./configure.win $RHOME
   cd $RHOME/src/gnuwin32
   make pkg-SJava

However, my command prompt won't recognize "unzip","./configure.win", or 
"make".  What should I do to make this work?

Neil Eastep.