well, there is still two hours left, but i'm too tired.
readme.txt file is included only in win32 release, so get it and read it first, sorry for inconvenience
Linux: to build from source you need 1. Download Lazarus, 2. git clone repository. 3. download latest ZenGL and put it to zengl folder (so there will be borderline/zengl/bin, borderline/zengl/src etc...) 4. Open borderline/src/project_desktop.lpi, build and run.