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Output from make -V (while not in the fftw3 directory):
However, any make command issued from inside /usr/ports/math/fftw3/ returns:
And therefore, math/fftw3 is unable to be processed.
# make -V CFLAGS -O2 -fno-strict-aliasing -pipe -march=opteron
# make -V CFLAGS Variable CFLAGS is recursive.