Smoke:

* WITH_BF_FFTW3 flag --> fftw3 scons + cmake settings refined. 
* Disabled by default since mac + win32 libs missing. Works already on win64 + linux (with installed fftw3 libs)

config/linux2-config.py

@@ -130,6 +130,12 @@ BF_OPENJPEG_LIB = ''
 BF_OPENJPEG_INC = '${BF_OPENJPEG}'
 BF_OPENJPEG_LIBPATH='${BF_OPENJPEG}/lib'
 
+WITH_BF_FFTW3 = False
+BF_FFTW3 = LIBDIR + '/usr'
+BF_FFTW3_INC = '${BF_FFTW3}/include'
+BF_FFTW3_LIB = 'fftw3'
+BF_FFTW3_LIBPATH = '${BF_FFTW3}/lib'
+
 WITH_BF_REDCODE = False  
 BF_REDCODE = '#extern/libredcode'
 BF_REDCODE_LIB = ''