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<h4 class="subsection">G.1.3 External Packages</h4>
<p>The following external packages are required:
<dl>
<dt>BLAS<dd>Basic Linear Algebra Subroutine library
(<a href="http://www.netlib.org/blas">http://www.netlib.org/blas</a>). Accelerated BLAS libraries such as
ATLAS (<a href="http://math-atlas.sourceforge.net">http://math-atlas.sourceforge.net</a>) are recommeded for
better performance.
<br><dt>LAPACK<dd>Linear Algebra Package (<a href="http://www.netlib.org/lapack">http://www.netlib.org/lapack</a>).
<br><dt>PCRE<dd>The Perl Compatible Regular Expression library (http://www.pcre.org).
</dl>
<p>The following external package is optional but strongly recommended:
<dl>
<dt>GNU Readline<dd>Command-line editing library (<a href="www.gnu.org/s/readline">www.gnu.org/s/readline</a>).
</dl>
<p>If you wish to build Octave without GNU readline installed, you must use
the <code>--disable-readline</code> option when running the configure script.
<p>The following external software packages are optional but recommended:
<dl>
<dt>ARPACK<dd>Library for the solution of large-scale eigenvalue problems
(<a href="http://forge.scilab.org/index.php/p/arpack-ng">http://forge.scilab.org/index.php/p/arpack-ng</a>). ARPACK is
required to provide the functions <code>eigs</code> and <code>svds</code>.
<br><dt>cURL<dd>Library for transferring data with URL syntax
(<a href="http://curl.haxx.se">http://curl.haxx.se</a>). cURL is required to provide the
<code>urlread</code> and <code>urlwrite</code> functions and the <code>ftp</code> class.
<br><dt>FFTW3<dd>Library for computing discrete Fourier transforms
(<a href="http://www.fftw.org">http://www.fftw.org</a>). FFTW3 is used to provide better
performance for functions that compute discrete Fourier transforms
(<code>fft</code>, <code>ifft</code>, <code>fft2</code>, etc.)
<br><dt>FLTK<dd>Portable GUI toolkit (<a href="http://www.fltk.org">http://www.fltk.org</a>). FLTK is currently
used to provide windows for Octave's OpenGL-based graphics functions.
<br><dt>fontconfig<dd>Library for configuring and customizing font access
(<a href="http://www.freedesktop.org/wiki/Software/fontconfig">http://www.freedesktop.org/wiki/Software/fontconfig</a>). Fontconfig
is used to manage fonts for Octave's OpenGL-based graphics functions.
<br><dt>FreeType<dd>Portable font engine (<a href="http://www.freetype.org">http://www.freetype.org</a>). FreeType is used
to perform font rendering for Octave's OpenGL-based graphics functions.
<br><dt>GLPK<dd>GNU Linear Programming Kit (<a href="http://www.gnu.org/software/glpk">http://www.gnu.org/software/glpk</a>).
GPLK is required for the function <code>glpk</code>.
<br><dt>gnuplot<dd>Interactive graphics program (<a href="http://www.gnuplot.info">http://www.gnuplot.info</a>). gnuplot
is currently the default graphics renderer for Octave.
<br><dt>GraphicsMagick++<dd>Image processing library (<a href="http://www.graphicsmagick.org">http://www.graphicsmagick.org</a>).
GraphicsMagick++ is used to provide the <code>imread</code> and <code>imwrite</code>
functions.
<br><dt>HDF5<dd>Library for manipulating portable data files
(<a href="http://www.hdfgroup.org/HDF5">http://www.hdfgroup.org/HDF5</a>). HDF5 is required for Octave's
<code>load</code> and <code>save</code> commands to read and write HDF data files.
<br><dt>OpenGL<dd>API for portable 2D and 3D graphics (<a href="http://www.opengl.org">http://www.opengl.org</a>). An
OpenGL implementation is required to provide Octave's OpenGL-based
graphics functions. Octave's OpenGL-based graphics functions usually
outperform the gnuplot-based graphics functions because plot data can be
rendered directly instead of sending data and commands to gnuplot for
interpretation and rendering.
<br><dt>Qhull<dd>Computational geometry library (<a href="http://www.qhull.org">http://www.qhull.org</a>). Qhull is
required to provide the functions <code>convhull</code>, <code>convhulln</code>,
<code>delaunay</code>, <code>delaunay3</code>, <code>delaunayn</code>, <code>voronoi</code>, and
<code>voronoin</code>.
<br><dt>QRUPDATE<dd>QR factorization updating library
(<a href="http://sourceforge.net/projects/qrupdate">http://sourceforge.net/projects/qrupdate</a>). QRUPDATE is used to
provide improved performance for the functions <code>qrdelete</code>,
<code>qrinsert</code>, <code>qrshift</code>, and <code>qrupdate</code>.
<br><dt>SuiteSparse<dd>Sparse matrix factorization library
(<a href="http://www.cise.ufl.edu/research/sparse/SuiteSparse">http://www.cise.ufl.edu/research/sparse/SuiteSparse</a>).
SuiteSparse is required to provide sparse matrix factorizations and
solution of linear equations for sparse systems.
<br><dt>zlib<dd>Data compression library (<a href="http://zlib.net">http://zlib.net</a>). The zlib library is
required for Octave's <code>load</code> and <code>save</code> commands to handle
compressed data, including <span class="sc">Matlab</span> v5 MAT files.
</dl>
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