libcal-dav-perl software package provides CalDAV client library, 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 libcal-dav-perl
libcal-dav-perl is installed in your system.
Make ensure the libcal-dav-perl package were installed using the commands given below,
$ sudo dpkg-query -l | grep libcal-dav-perl *
You will get with libcal-dav-perl package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Perl |
| Package | libcal-dav-perl |
| Version | 0.6-2 |
| Description | CalDAV client library |
| Sub Section | Perl |