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src/spectral/fft.c: add message about fftw3 being able to do non-power of two sizes

--- a/src/spectral/fft.c

+++ b/src/spectral/fft.c

@@ -188,8 +188,8 @@

   s->fftSetup = aubio_vDSP_create_fftsetup(s->log2fftsize, FFT_RADIX2);

 #else                         // using OOURA

   if (aubio_is_power_of_two(winsize) != 1) {

-    AUBIO_ERR("fft: can only create with sizes power of two,"

-              " requested %d\n", winsize);

+    AUBIO_ERR("fft: can only create with sizes power of two, requested %d,"

+        " try recompiling aubio with --enable-fftw3\n", winsize);

     goto beach;

   }

   s->winsize = winsize;

-- 

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