libindigo-dev software package provides Organic Chemistry Toolkit (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 libindigo-dev
libindigo-dev is installed in your system.
Make ensure the libindigo-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libindigo-dev *
You will get with libindigo-dev package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Library development |
| Package | libindigo-dev |
| Version | 1.1.12-1.1 |
| Description | Organic Chemistry Toolkit (development files) |
| Sub Section | Devel |