So I think I am getting close, thank you for your patience.
 
I installed the subversion package and typed
"svn co https://nitrc.org/svn/cmtk/trunk/core cmtk"
which indeed installed the files in the directory cmtk. This directory is in my cygwin/home/username directory.  So from this directory (cygwin/home/username) I then type
"mkdir cmtk-build"
"cd cmtk-build"
"cmake ../cmtk"
And I get the answer:
"-bash: cmake: command not found"

I feel that maybe I am not in the right directory, but I have tried around with no luck.  Where am I going wrong?
Thanks!