to use third-party software for visualization, such as \vmd{}
\url{http://www.ks.uiuc.edu/Research/vmd/} or \pymol{}
\url{http://www.pymol.org/}.
-\item A few \gromacs{} tools get some extra functionality when linked with the
-GNU scientific library GSL.
\item Running the \gromacs{} test suite requires \libxmltwo{}
\item Building the \gromacs{} manual requires ImageMagick, pdflatex
and bibtex