libecal1.2-dev software package provides Client library for evolution calendars (development files), 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 libecal1.2-dev
libecal1.2-dev is installed in your system.
Make ensure the libecal1.2-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libecal1.2-dev *
You will get with libecal1.2-dev package name, version, architecture and description in a table
| Distro | Debian 8 jessie |
| Section | Library development |
| Package | libecal1.2-dev |
| Version | 3.12.9~git20141128.5242b0-2+de |
| Description | Client library for evolution calendars (development files) |
| Sub Section | Libdevel |