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/usr/lib/pkgconfig/fftw3l.pc is in libfftw3-dev 3.3-1ubuntu1.

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prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

Name: FFTW
Description: fast Fourier transform library
Version: 3.3
Libs: -L${libdir} -lfftw3l  -lm
Cflags: -I${includedir}