Wrappers are delivered as source code, which you must compile to build the wrapper library. Then you can substitute the wrapper and Intel MKL libraries for the FFTW library. The source code for the wrappers and makefiles with the wrapper list files are located in the .\interfaces\fftw2xc and .\interfaces\fftw2xf subdirectory in the Intel MKL directory for C and Fortran wrappers, respectively.
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