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<h4 class="subsection">G.1.2 Build Tools</h4>
<p>The following tools are required:
<dl>
<dt>C++, C, and Fortran compilers<dd>The Octave sources are primarily written in C++, but some portions are
also written in C and Fortran. The Octave sources are intended to be
portable. Recent versions of the GNU compiler collection (GCC) should
work (<a href="http://gcc.gnu.org">http://gcc.gnu.org</a>). If you use GCC, you should avoid
mixing versions. For example, be sure that you are not using the
obsolete <code>g77</code> Fortran compiler with modern versions of <code>gcc</code>
and <code>g++</code>.
<br><dt>GNU Make<dd>Tool for building software (<a href="http://www.gnu.org/software/make">http://www.gnu.org/software/make</a>).
Octave's build system requires GNU Make. Other versions of Make will
not work. Fortunately, GNU Make is highly portable and easy to install.
<br><dt>AWK, sed, and other Unix utilities<dd>Basic Unix system utilities are required for building Octave. All will
be available with any modern Unix system and also on Windows with either
Cygwin or MinGW and MSYS.
</dl>
<p>Additionally, the following tools may be needed:
<dl>
<dt>Bison<dd>Parser generator (<a href="http://www.gnu.org/software/bison">http://www.gnu.org/software/bison</a>).
You will need Bison if you modify the <code>oct-parse.yy</code> source file or
if you delete the files that are generated from it.
<br><dt>Flex<dd>Lexer analyzer (<a href="http://www.gnu.org/software/flex">http://www.gnu.org/software/flex</a>). You will need
Flex if you modify the <code>lex.ll</code> source file or if you delete the
files that are generated from it.
<br><dt>Autoconf<dd>Package for software configuration
(<a href="http://www.gnu.org/software/autoconf">http://www.gnu.org/software/autoconf</a>). Autoconf is required if
you modify Octave's <code>configure.ac</code> file or other files that it
requires.
<br><dt>Automake<dd>Package for Makefile generation
(<a href="http://www.gnu.org/software/automake">http://www.gnu.org/software/automake</a>). Automake is required if
you modify Octave's <code>Makefile.am</code> files or other files that they
depend on.
<br><dt>Libtool<dd>Package for building software libraries
(<a href="http://www.gnu.org/software/libtool">http://www.gnu.org/software/libtool</a>). Libtool is required by
Automake.
</dl>
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