freecad-dev software package provides FreeCAD 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 freecad-dev
freecad-dev is installed in your system.
Make ensure the freecad-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep freecad-dev *
You will get with freecad-dev package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Library development |
| Package | freecad-dev |
| Version | 0.15.4671+dfsg1-4 |
| Description | FreeCAD development files |
| Sub Section | Devel |