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Previous: <a href="Build-Tools.html" accesskey="p" rel="prev">Build Tools</a>, Up: <a href="Build-Dependencies.html" accesskey="u" rel="up">Build Dependencies</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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<h4 class="subsection" id="External-Packages-1"><span>E.1.3 External Packages<a class="copiable-link" href="#External-Packages-1"> ¶</a></span></h4>
<p>The following external packages are required:
</p>
<dl class="table">
<dt>BLAS</dt>
<dd><p>Basic Linear Algebra Subroutine library. Accelerated <small class="sc">BLAS</small> libraries such
as OpenBLAS (<a class="url" href="https://www.openblas.net/">https://www.openblas.net/</a>) or
ATLAS (<a class="url" href="http://math-atlas.sourceforge.net">http://math-atlas.sourceforge.net</a>) are recommended for best
performance. The reference implementation (<a class="url" href="http://www.netlib.org/blas">http://www.netlib.org/blas</a>)
is slow and suffers from certain bugs in corner case inputs.
</p>
</dd>
<dt>LAPACK</dt>
<dd><p>Linear Algebra Package (<a class="url" href="http://www.netlib.org/lapack">http://www.netlib.org/lapack</a>).
</p>
</dd>
<dt>PCRE</dt>
<dd><p>The Perl Compatible Regular Expression library (<a class="url" href="https://www.pcre.org">https://www.pcre.org</a>).
</p></dd>
</dl>
<p>The following external package is optional but strongly recommended:
</p>
<dl class="table">
<dt>GNU Readline</dt>
<dd><p>Command-line editing library (<a class="url" href="https://www.gnu.org/s/readline">https://www.gnu.org/s/readline</a>).
</p></dd>
</dl>
<p>If you wish to build Octave without GNU readline installed, you must use
the <samp class="option">--disable-readline</samp> option when running the configure script.
</p>
<p>The following external software packages are optional. Octave can be
built without them but certain features might be missing:
</p>
<dl class="table">
<dt>ARPACK</dt>
<dd><p>Library for the solution of large-scale eigenvalue problems
(<a class="url" href="https://forge.scilab.org/index.php/p/arpack-ng">https://forge.scilab.org/index.php/p/arpack-ng</a>). <small class="sc">ARPACK</small> is
required to provide the functions <code class="code">eigs</code> and <code class="code">svds</code>.
</p>
</dd>
<dt>cURL</dt>
<dd><p>Library for transferring data with URL syntax
(<a class="url" href="https://curl.haxx.se">https://curl.haxx.se</a>). cURL is required to provide the
<code class="code">urlread</code> and <code class="code">urlwrite</code> functions and the <code class="code">ftp</code> class.
</p>
</dd>
<dt>FFTW3</dt>
<dd><p>Library for computing discrete Fourier transforms
(<a class="url" 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 class="code">fft</code>, <code class="code">ifft</code>, <code class="code">fft2</code>, etc.)
</p>
</dd>
<dt>FLTK</dt>
<dd><p>Portable GUI toolkit (<a class="url" href="http://www.fltk.org">http://www.fltk.org</a>). FLTK can be
used to provide windows for Octave’s OpenGL-based graphics functions.
</p>
</dd>
<dt>fontconfig</dt>
<dd><p>Library for configuring and customizing font access
(<a class="url" href="https://www.freedesktop.org/wiki/Software/fontconfig">https://www.freedesktop.org/wiki/Software/fontconfig</a>). Fontconfig
is used to manage fonts for Octave’s OpenGL-based graphics functions.
</p>
</dd>
<dt>FreeType</dt>
<dd><p>Portable font engine (<a class="url" href="https://www.freetype.org">https://www.freetype.org</a>). FreeType is used
to perform font rendering for Octave’s OpenGL-based graphics functions.
</p>
</dd>
<dt>GLPK</dt>
<dd><p>GNU Linear Programming Kit (<a class="url" href="https://www.gnu.org/software/glpk">https://www.gnu.org/software/glpk</a>).
GPLK is required for the function <code class="code">glpk</code>.
</p>
</dd>
<dt>gl2ps</dt>
<dd><p>OpenGL to PostScript printing library (<a class="url" href="https://www.geuz.org/gl2ps/">https://www.geuz.org/gl2ps/</a>).
gl2ps is required for printing when using OpenGL-based
graphics toolkits (currently either FLTK or Qt).
</p>
</dd>
<dt>gnuplot</dt>
<dd><p>Interactive graphics program (<a class="url" href="http://www.gnuplot.info">http://www.gnuplot.info</a>). gnuplot
can be used as a graphics renderer for Octave; prior to Octave 4.0,
gnuplot was the default graphics renderer.
</p>
</dd>
<dt>GraphicsMagick++</dt>
<dd><p>Image processing library (<a class="url" href="http://www.graphicsmagick.org">http://www.graphicsmagick.org</a>).
GraphicsMagick++ is used to provide the <code class="code">imread</code> and <code class="code">imwrite</code>
functions.
</p>
</dd>
<dt>HDF5</dt>
<dd><p>Library for manipulating portable data files
(<a class="url" href="https://www.hdfgroup.org/HDF5">https://www.hdfgroup.org/HDF5</a>). <small class="sc">HDF5</small> is required for Octave’s
<code class="code">load</code> and <code class="code">save</code> commands to read and write HDF data files.
</p>
</dd>
<dt>Java Development Kit</dt>
<dd><p>Java programming language compiler and libraries. The OpenJDK free
software implementation is recommended (<a class="url" href="http://openjdk.java.net/">http://openjdk.java.net/</a>),
although other JDK implementations may work. Java is required to be able
to call Java functions from within Octave.
</p>
</dd>
<dt>OpenGL</dt>
<dd><p>API for portable 2-D and 3-D graphics (<a class="url" href="https://www.opengl.org">https://www.opengl.org</a>). An
OpenGL implementation can be used to provide a renderer for Octave’s
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. Since Octave 4.0, the default graphics
renderer (<code class="code">"qt"</code>) has been OpenGL-based.
</p>
</dd>
<dt>PortAudio</dt>
<dd><p>PortAudio (<a class="url" href="http://www.portaudio.com/">http://www.portaudio.com/</a>) provides a very simple API
for recording and/or playing sound using a simple callback function or
a blocking read/write interface. It is required for the audio processing
functions <code class="code">audioplayer</code>, <code class="code">audiorecorder</code>, and
<code class="code">audiodevinfo</code>.
</p>
</dd>
<dt>Qhull</dt>
<dd><p>Computational geometry library (<a class="url" href="http://www.qhull.org">http://www.qhull.org</a>). Qhull is
required to provide the functions <code class="code">convhull</code>, <code class="code">convhulln</code>,
<code class="code">delaunay</code>, <code class="code">delaunayn</code>, <code class="code">voronoi</code>, and <code class="code">voronoin</code>.
</p>
</dd>
<dt>QRUPDATE</dt>
<dd><p>QR factorization updating library
(<a class="url" href="https://sourceforge.net/projects/qrupdate">https://sourceforge.net/projects/qrupdate</a>). QRUPDATE is used to
provide improved performance for the functions <code class="code">qrdelete</code>,
<code class="code">qrinsert</code>, <code class="code">qrshift</code>, and <code class="code">qrupdate</code>.
</p>
</dd>
<dt>QScintilla</dt>
<dd><p>Source code highlighter and manipulator; a Qt port of Scintilla
(<a class="url" href="http://www.riverbankcomputing.co.uk/software/qscintilla">http://www.riverbankcomputing.co.uk/software/qscintilla</a>).
QScintilla is used for syntax highlighting and code completion in the
GUI.
</p>
</dd>
<dt>Qt</dt>
<dd><p>GUI and utility libraries (<a class="url" href="https://www.qt.io">https://www.qt.io</a>). Qt is required for
building the GUI. It is a large framework, but the only components
required are the GUI, core, and network modules. Since Octave 4.0, the
default graphics renderer (<code class="code">"qt"</code>) has been Qt-based, which has
been OpenGL-based.
</p>
</dd>
<dt>RapidJSON</dt>
<dd><p>A fast JSON parser/generator for C++ with both SAX/DOM style API
(<a class="url" href="https://rapidjson.org/">https://rapidjson.org/</a>). RapidJSON is required to read or write
from or to JSON files with the functions <code class="code">jsondecode</code> and
<code class="code">jsonencode</code>.
</p>
</dd>
<dt>SuiteSparse</dt>
<dd><p>Sparse matrix factorization library
(<a class="url" href="http://faculty.cse.tamu.edu/davis/suitesparse.html">http://faculty.cse.tamu.edu/davis/suitesparse.html</a>).
SuiteSparse is required to provide sparse matrix factorizations and
solution of linear equations for sparse systems.
</p>
</dd>
<dt>SUNDIALS</dt>
<dd><p>The SUite of Nonlinear and DIfferential/ALgebraic Equation Solvers
(<a class="url" href="https://computation.llnl.gov/projects/sundials">https://computation.llnl.gov/projects/sundials</a>) is required for
the Ordinary Differential Equations (ODE) solvers <code class="code">ode15i</code> and
<code class="code">ode15s</code>.
</p>
</dd>
<dt>zlib</dt>
<dd><p>Data compression library (<a class="url" href="https://zlib.net">https://zlib.net</a>). The zlib library is
required for Octave’s <code class="code">load</code> and <code class="code">save</code> commands to handle
compressed data, including <small class="sc">MATLAB</small> v5 MAT files.
</p></dd>
</dl>
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