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<h3 class="section">2.2 Compiling and Linking</h3>
<p><a name="index-compiling-programs_002c-include-paths-26"></a><a name="index-including-GSL-header-files-27"></a><a name="index-header-files_002c-including-28"></a>The library header files are installed in their own <samp><span class="file">gsl</span></samp>
directory. You should write any preprocessor include statements with a
<samp><span class="file">gsl/</span></samp> directory prefix thus,
<pre class="example"> #include <gsl/gsl_math.h>
</pre>
<p class="noindent">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><span class="file">gsl</span></samp>
directory is <samp><span class="file">/usr/local/include/gsl</span></samp>. A typical compilation
command for a source file <samp><span class="file">example.c</span></samp> with the GNU C compiler
<code>gcc</code> is,
<pre class="example"> $ gcc -Wall -I/usr/local/include -c example.c
</pre>
<p class="noindent">This results in an object file <samp><span class="file">example.o</span></samp>. The default
include path for <code>gcc</code> searches <samp><span class="file">/usr/local/include</span></samp> automatically so
the <code>-I</code> option can actually be omitted when GSL is installed
in its default location.
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<li><a accesskey="2" href="Linking-with-an-alternative-BLAS-library.html">Linking with an alternative BLAS library</a>
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