Hi Xiaojing:

Greg already pointed out that CMTK installs in /opt/local on OSX.

Regarding Ubuntu - if your OS is i686 (32bit) then you can indeed not run the 64bit (x86_64) CMTK. We no longer have a 32bit build system here, and no one ever seemed to download the binaries anyway, so I haven't been providing a 32bit Linux package for a while.

Building CMTK from source is quite straight forward:

- Download the CMTK source archive (from the same download page as the binary packages)
- Unpack archive using "tar -xzvf CMTK-2.2.4-Source.tar.gz"
- Make a build directory: "mkdir cmtk-build"
- "cd cmtk-build"
- Configure: "cmake ../cmtk-2.2.4/"
- Build: "make"

After that, you should have all binaries in cmtk-build/bin/, from whence you should be able to run them directly.