fftw2-single software package provides virtual package provided by sfftw2, 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 fftw2-single
fftw2-single is installed in your system.
Make ensure the fftw2-single package were installed using the commands given below,
$ sudo dpkg-query -l | grep fftw2-single*
You will get with fftw2-single package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Virtual packages |
| Package | fftw2-single |
| Version | |
| Description | virtual package provided by sfftw2 |
| Sub Section | virtual |