ter versions of
<code>gcc</code>.  
<p>
Versions 8.0 and 8.1 of Intel's <code>icc</code> falsely claim to be <code>gcc</code>, so you should specify <code>CC=&quot;icc -no-gcc&quot;</code>; this is automatic in FFTW 3.1.  <code>icc-8.0.066</code> reportely produces incorrect code for FFTW 2.1.5, but is fixed in version 8.1. 
<code>icc-7.1</code> compiler build 20030402Z appears to produce
incorrect dependencies, causing the compilation to fail. 
<code>icc-7.1</code> build 20030307Z appears to work fine.  (U