libfcgi-perl software package provides helper module for FastCGI, you can install in your Debian 8 (Jessie) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libfcgi-perl
libfcgi-perl is installed in your system.
Make ensure the libfcgi-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libfcgi-perl *
You will get with libfcgi-perl package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Perl |
| Package | libfcgi-perl |
| Version | 0.77-1+b1 [amd64, arm64, armel |
| Description | helper module for FastCGI |
| Sub Section | Perl |