libcgal-qt4-dev software package provides C++ library for computational geometry (development files, support for Qt4), 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 libcgal-qt4-dev
libcgal-qt4-dev is installed in your system.
Make ensure the libcgal-qt4-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libcgal-qt4-dev *
You will get with libcgal-qt4-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libcgal-qt4-dev |
| Version | 4.2-5ubuntu1 |
| Description | C++ library for computational geometry (development files, support for Qt4) |
| Sub Section | libdevel |