1. sudo apt-get build-dep tora
2. sudo apt-get install libqscintilla2-dev
3. Download instant client of Oracle Database (all zip files and extract them to one folder)
4. ./configure –with-instant-client=PATH_TO_YOUR_INSTANT_CLIENT_FOLDER
5. Follow the instructions – if any – and complete any missing steps
6. make
7. sudo make install

If you have any questions, please don’t hesitate to ask here.