Failure to find FFTW libraries on Mac Big Sur (11.3.1)

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Im sure anyone reading this is all too familiar with issues such as mine (given by the number of posts referring to this issue). I am running Mac OS X Big Sur (11.3.1). I have python 3.9.4 installed via pyenv which is installed through home-brew. I have also installed FFTW through home-brew and followed the Mac installation instructions.

export DYLD_LIBRARY_PATH=/usr/local/lib
export LDFLAGS="-L/usr/local/include"
export CFLAGS="-I/usr/local/include"

Unfortunately pyfftw still fails to find the FFTW libraries when installing via pip. Any advice would be greatly appreciated.

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