libfreeradius-dev software package provides FreeRADIUS shared library development files, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libfreeradius-dev
libfreeradius-dev is installed in your system.
Make ensure the libfreeradius-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libfreeradius-dev *
You will get with libfreeradius-dev package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Library development |
| Package | libfreeradius-dev |
| Version | 2.2.8+dfsg-0.1build2 |
| Description | FreeRADIUS shared library development files |
| Sub Section | Devel |