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Programs using FFTW can be compiled by below steps. Below trial.f is a program which uses subroutines from fftw.

For GNU gfortran:

gfortran trial.f lfftw3

For Intel ifort:

module load icc_17

ifort trial.f -lfftw3


ifort trial.f -mkl

For Use in Makefiles:

If you are using makefiles then add the LAPACK and BLAS options to the FFLAGS variable as shown below:

FFLAGS = -O2 -lfftw3

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