libappindicator3-dev software package provides Application Indicators, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install libappindicator3-dev
libappindicator3-dev is installed in your system.
Make ensure the libappindicator3-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libappindicator3-dev *
You will get with libappindicator3-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libappindicator3-dev |
| Version | 12.10.1+13.10.20130920-0ubuntu |
| Description | Application Indicators |
| Sub Section | libdevel |