fftw3 software package provides virtual package provided by libfftw3-3, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fftw3
fftw3 is installed in your system.
Make ensure the fftw3 package were installed using the commands given below,
$ sudo dpkg-query -l | grep fftw3*
You will get with fftw3 package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Virtual packages |
| Package | fftw3 |
| Version | |
| Description | virtual package provided by libfftw3-3 |
| Sub Section | virtual |
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