 C
4.2</code> 
<p>
then the compiler is wrong.  The right message is something like

<p>
<code>cc: WorkShop Compilers 4.2 30 Oct 1996 C
4.2</code> 
<h2><A name="3dnow">
Question 2.5.  What's the difference between
<code>--enable-3dnow</code> and <code>--enable-k7</code>?
</A></h2>

<code>--enable-k7</code> enables 3DNow! instructions on K7 processors
(AMD Athlon and its variants).  K7 support is provided by assembly
routines generated by a special purpose compiler. 
As of fftw-3.2, --enable-k7 is no longer 