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<h3 class="section">6.1 FFTW MPI Installation</h3>
<p>All of the FFTW MPI code is located in the <code>mpi</code> subdirectory of
the FFTW package. On Unix systems, the FFTW MPI libraries and header
files are automatically configured, compiled, and installed along with
the uniprocessor FFTW libraries simply by including
<code>--enable-mpi</code> in the flags to the <code>configure</code> script
(see <a href="Installation-on-Unix.html#Installation-on-Unix">Installation on Unix</a>).
<a name="index-configure-349"></a>
<p>Any implementation of the MPI standard, version 1 or later, should
work with FFTW. The <code>configure</code> script will attempt to
automatically detect how to compile and link code using your MPI
implementation. In some cases, especially if you have multiple
different MPI implementations installed or have an unusual MPI
software package, you may need to provide this information explicitly.
<p>Most commonly, one compiles MPI code by invoking a special compiler
command, typically <code>mpicc</code> for C code. The <code>configure</code>
script knows the most common names for this command, but you can
specify the MPI compilation command explicitly by setting the
<code>MPICC</code> variable, as in ‘<samp><span class="samp">./configure MPICC=mpicc ...</span></samp>’.
<a name="index-mpicc-350"></a>
<p>If, instead of a special compiler command, you need to link a certain
library, you can specify the link command via the <code>MPILIBS</code>
variable, as in ‘<samp><span class="samp">./configure MPILIBS=-lmpi ...</span></samp>’. Note that if
your MPI library is installed in a non-standard location (one the
compiler does not know about by default), you may also have to specify
the location of the library and header files via <code>LDFLAGS</code> and
<code>CPPFLAGS</code> variables, respectively, as in ‘<samp><span class="samp">./configure
LDFLAGS=-L/path/to/mpi/libs CPPFLAGS=-I/path/to/mpi/include ...</span></samp>’.
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