Assume you already have used directory Obj to compile SIESTA, i.e. you have
a fully functioning arch.make file.
Then you edit your arch.make file in the Obj directory to contain these
flags:
FFTW_INCFLAGS=-I<path to FFTW 3>/include
FFTW_LIBS= -L<path to FFTW 3>/lib -lfftw3

If you have installed FFTW globally, you probably only need to do:
FFTW_INCFLAGS=
FFTW_LIBS= -lfftw3

Kind regards Nick


2013/9/22 ARNAB MAJUMDAR <[email protected]>

> Hi,
>    I am a new user of siesta. I cant understand how to edit the makefile in
> the STM directory by adding the proper library functions of fftw.
> I would be obliged of I got some guidance.
>
> Regards,
> Arnab
>

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