Editing Building

: '' This article provides general information about building GNU Octave from source.  If you just want to install Octave, see [[:Category:Installation]].''

== General steps ==

# Install all [[#Dependencies|build dependencies]] (see below).
# Getting the Octave sources ...
#* ... from the development repository
<div style="margin-left:5em;">
 hg clone https://www.octave.org/hg/octave && \
 cd octave                                  && \
 ./bootstrap
</div>
::* ... from a release
<div style="margin-left:5em;">
 wget https://ftpmirror.gnu.org/octave/octave-{{Release}}.tar.gz && \
 tar -xzf octave-{{Release}}.tar.gz                               && \
 cd octave-{{Release}}
</div>
: 3. Configure, build, check, and install Octave
<div style="margin-left:3em;">
 mkdir .build                            && \
 cd    .build                            && \
 ./../configure --prefix=$HOME/my_octave && \ <ref><code>--prefix</code> determines the installation location. See [[#Install Octave in home directory|Tweaks section]] for details.</ref>
 make -j2                                && \ <ref>Depending on your system and processor count, use a larger number of parallel jobs, e.g. <code>-j8</code>.</ref>
 make check                              && \
 make install
</div>

== Dependencies ==

Most of the dependencies given in this section can be very conveniently installed on many [[Octave for GNU/Linux|GNU/Linux]] systems.  Please read the respective wiki page for your distribution on the [[Octave for GNU/Linux]] page.

On [[Octave for Microsoft Windows|MS Windows]] and [[Octave for macOS|macOS]] systems the generic Octave build process described on this page needs some more effort to fulfill the described build dependencies.  Please read [[Octave for Microsoft Windows]] and [[Octave for macOS]] for information how to build Octave for the respective systems.

Dependencies marked with <span style="background:lightgreen">green background</span> are '''required''' for building Octave.  All other tools and libraries are recommended/optional, but very useful features (like the GUI, plotting, etc.) are likely to be disabled.

=== Build tools ===

{| class="wikitable"
|-
! Dependency
! Description
! License / Copyright
|-style="background:lightgreen"
| [https://www.gnu.org/software/autoconf Autoconf]
| Software configuration
| GNU GPL v3.0
|-style="background:lightgreen"
| [https://www.gnu.org/software/automake Automake]
| Makefile generator
| GNU GPL v3.0
|-style="background:lightgreen"
| [https://gcc.gnu.org C++, C, and Fortran compilers]
| Compiling the source code
| GNU GPL v3.0
|-style="background:lightgreen"
| [https://www.gnu.org/software/make GNU Make]
| Makefile processor
| GNU GPL v3.0
|-style="background:lightgreen"
| [https://www.gnu.org/software/libtool Libtool]
| Dependency of automake
| Free Software Foundation
|-style="background:lightgreen"
| Unix utilities: gawk, gperf, less, ncurses
| Miscellaneous tasks
| GNU GPL v3.0
|-
| [https://www.gnu.org/software/bison Bison]
| Parser generator
| GNU GPL v3.0
|-
| [https://www.gnu.org/software/flex Flex]
| Lexical analyzer
| The Flex project
|}

=== Documentation tools ===

{| class="wikitable"
|-
! Dependency
! Description
! License / Copyright
|-
| [http://www.ghostgum.com.au/software/epstool.htm epstool]
| Epstool is a utility to create or extract preview images in EPS files, fix bounding boxes and convert to bitmaps.
| GNU GPL v2.0
|-
| [https://www.freetype.org FTGL]
| Portable font engine to perform font rendering for Octave’s OpenGL-based graphics functions.
| GNU GPL v2.0
|-
| [http://geuz.org/gl2ps GL2PS]
| GL2PS is a C library providing high quality vector output for any OpenGL application.
| GNU LGPL v2.0
|-
| [https://www.nongnu.org/texi2html Texi2HTML]
| Perl script which converts Texinfo source files to HTML output.
| GNU GPL v3.0
|-
| [https://www.gnu.org/software/texinfo Texinfo]
| Documentation system that uses a single source to produce both on-line information and printed output.
| GNU GPL v3.0
|-
| [https://www.tug.org/texlive/ TeX Live]
| TeX document production system including all the major TeX-related programs, macro packages, and fonts that are free software.
| Freely redistributable as defined by the Free Software Foundation
|}

=== External tools and libraries ===

{| class="wikitable"
|-
! Dependency
! Description
! License / Copyright
|-style="background:lightgreen"
| [https://www.netlib.org/blas BLAS]
| Basic Linear Algebra Subroutine library
| Free - proper attribution request
|-style="background:lightgreen"
| [https://netlib.org/lapack LAPACK]
| Linear Algebra Package
| Free - proper attribution request
|-style="background:lightgreen"
| [https://www.pcre.org PCRE]
| Perl Compatible Regular Expression library
| Free
|-style="background:lightgreen"
| [https://www.gnu.org/software/readline GNU Readline]
| Command-line editing library
| GNU GPL v3.0
|-
| [https://github.com/opencollab/arpack-ng ARPACK-NG]
| Solution of large-scale eigenvalue problems
| BSD like - various authors
|-
| [https://curl.haxx.se cURL]
| Library for transferring data with URL syntax
| Free Software -- main author
|-
| [http://www.fftw.org FFTW3]
| Library for computing discrete Fourier transforms
| MIT -- GNU GPL v2.0
|-
| [https://www.fltk.org FLTK]
| Portable GUI toolkit
| GNU GPL v2.0 with static linking exception
|-
| [https://www.freedesktop.org/wiki/Software/fontconfig fontconfig]
| Library for configuring and customizing font access
| Provided "as is" -- various authors
|-
| [https://www.freetype.org FreeType]
| Portable font engine
| compatible with GNU GPL v3.0
|-
| [https://www.gnu.org/software/glpk GLPK]
| GNU Linear Programming Kit
| GNU GPL v3.0
|-
| [http://www.gnuplot.info gnuplot]
| Interactive graphics program
| Provided "as is" -- various authors
|-
| [http://www.graphicsmagick.org GraphicsMagick++]
| Image processing library
| various -- integrates many third-party libs
|-
| [https://www.hdfgroup.org/solutions/hdf5 HDF5]
| Library for manipulating portable data files
| BSD - like
|-
| [https://www.opengl.org OpenGL]
| API for portable 2D and 3D graphics
| Free specs -- license is driver dependent
|-
| [http://www.qhull.org Qhull]
| Computational geometry library
| Free software -- specific
|-
| [http://sourceforge.net/projects/qrupdate QRUPDATE]
| QR factorization updating library
| GNU GPL v3.0
|-
| [http://faculty.cse.tamu.edu/davis/suitesparse.html SuiteSparse]
| Sparse matrix factorization library
| Main author
|-
| [https://zlib.net zlib]
| Data compression library
| Provided "as is" -- various authors
|}

== Tweaks ==

=== Install Octave in home directory ===

To install multiple versions of GNU Octave on one system, it is recommended to use the <code>--prefix</code> option of the <code>configure</code> script.  With this option one can determine a custom installation directory, preferably within your user's home directory, to avoid elevated installation privileges.  One does not "clutter" the system by running <code>sudo make install</code> and the custom build Octave can coexist with, for example, your Linux distribution installation of Octave.

In order to start the custom build of Octave almost as convenient as the Linux distribution installation of Octave, one can create an alias within {{Path|.bashrc}}:

 echo "alias myoctave='$HOME/my_octave/bin/octave'" >> ~/.bashrc

Then update your {{Path|.bashrc}} without doing logout and login:

 source $HOME/.bashrc

If you simply enter <code>octave</code>, you'll start your Linux distribution installation of Octave. But when you enter <code>myoctave</code>, you'll start your custom build of Octave inside your home directory.

=== Uninstall ===

# If you still have the {{Path|.build}} folder, just run <code>make uninstall</code> from it.
# Just delete the install folder, e.g. <code>rm -rf $HOME/my_octave</code>.

In any case, don't forget to remove any created ''alias'' entries in {{Path|~/.bashrc}}.

=== Large array support ===

: ''Main article: [[Enable large arrays: Build octave such that it can use arrays larger than 2Gb.]]''

== See also ==

* [https://hg.savannah.gnu.org/hgweb/octave/file/tip/README <code>README</code>] and [https://hg.savannah.gnu.org/hgweb/octave/file/tip/etc/HACKING.md <code>/etc/HACKING.md</code>] in the development repository. 
* https://octave.org/doc/interpreter/Installation.html
* [[MXE]] -- a more customized Octave build including many self-compiled tools.

== Footnotes ==

<references/>

[[Category:Building]]