libsaga-dev software package provides SAGA GIS development files, 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 libsaga-dev
libsaga-dev is installed in your system.
Make ensure the libsaga-dev package were installed using the commands given below,
$ sudo dpkg-query -l | grep libsaga-dev *
You will get with libsaga-dev package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Library development |
| Package | libsaga-dev |
| Version | 2.1.0+dfsg-1build2 |
| Description | SAGA GIS development files |
| Sub Section | libdevel |