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<title>GNU Scientific Library &ndash; Reference Manual: Compiling and Linking</title>

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<a name="Compiling-and-Linking"></a>
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<p>
Next: <a href="Shared-Libraries.html#Shared-Libraries" accesskey="n" rel="next">Shared Libraries</a>, Previous: <a href="An-Example-Program.html#An-Example-Program" accesskey="p" rel="previous">An Example Program</a>, Up: <a href="Using-the-library.html#Using-the-library" accesskey="u" rel="up">Using the library</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Compiling-and-Linking-1"></a>
<h3 class="section">2.2 Compiling and Linking</h3>
<a name="index-compiling-programs_002c-include-paths"></a>
<a name="index-including-GSL-header-files"></a>
<a name="index-header-files_002c-including"></a>
<p>The library header files are installed in their own <samp>gsl</samp>
directory.  You should write any preprocessor include statements with a
<samp>gsl/</samp> directory prefix thus,
</p>
<div class="example">
<pre class="example">#include &lt;gsl/gsl_math.h&gt;
</pre></div>

<p>If the directory is not installed on the standard search path of your
compiler you will also need to provide its location to the preprocessor
as a command line flag.  The default location of the <samp>gsl</samp>
directory is <samp>/usr/local/include/gsl</samp>.  A typical compilation
command for a source file <samp>example.c</samp> with the GNU C compiler
<code>gcc</code> is,
</p>
<div class="example">
<pre class="example">$ gcc -Wall -I/usr/local/include -c example.c
</pre></div>

<p>This results in an object file <samp>example.o</samp>.   The default
include path for <code>gcc</code> searches <samp>/usr/local/include</samp> automatically so
the <code>-I</code> option can actually be omitted when GSL is installed 
in its default location.
</p>
<table class="menu" border="0" cellspacing="0">
<tr><td align="left" valign="top">&bull; <a href="Linking-programs-with-the-library.html#Linking-programs-with-the-library" accesskey="1">Linking programs with the library</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Linking-with-an-alternative-BLAS-library.html#Linking-with-an-alternative-BLAS-library" accesskey="2">Linking with an alternative BLAS library</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">
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