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Description
If there is interest, I could provide an FFT library implemented in C99 that is based on fftpack, but falls back to Bluestein's algorithm for near-prime lengths. Accuracy should also be better than the original fftpack.
You can have a look at the code at https://gitlab.mpcdf.mpg.de/mtr/pocketfft
I can contribute this under the 3-clause BSD license, but I haven't added the necessary file headers yet.