fftw3-doc software package provides virtual package provided by libfftw3-doc, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fftw3-doc
fftw3-doc is installed in your system.
Make ensure the fftw3-doc package were installed using the commands given below,
$ sudo dpkg-query -l | grep fftw3-doc*
You will get with fftw3-doc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Virtual packages |
| Package | fftw3-doc |
| Version | |
| Description | virtual package provided by libfftw3-doc |
| Sub Section | Virtual |
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