Intel® oneAPI Math Kernel Library Developer Reference - C
Wrappers are delivered as source code, which you must compile to build the wrapper library. Then you can substitute the wrapper and Intel® oneAPI Math Kernel Library libraries for the FFTW library. The source code for the wrappers, makefiles, and files with lists of wrappers are located in the.\interfaces\fftw2xcsubdirectory in the Intel® oneAPI Math Kernel Library directory.