$ 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

libfcgi-perl package basic information: