+ \item \textbf{wxWindows 2.3}\\
+ Used for the platform-independent graphical interface. The graphical version
+ of \ctsim\ requires this library.\\
+ \urlref{Web site}{http://www.wxwindows.org}
+
+ \item \textbf{FFTW}\\
+ Used for fast Fourier transformations of projections and images.
+ Without this library \ctsim\ will use slower, traditional Fourier transformations.\\
+ \urlref{Web site}{http://www.fftw.org}