[Lazarus] Lazarus Make Parameters

[Joe]

Some silly questions from an Make beginner:
Where can I find a enumeration and explanations of the Lazarus Make 
parameters like OPT='-dLCLGtk2Fix30545' and '-dVerboseKeyboard'?
Until now, I only did Lazarus SVN CheckOut and Lazarus Make with Trunk. 
How to do it with 'Release' and 'Fix' Versions? Whats the exact 
difference between these versions? Are there more versions available 
than Trunk, Release and Fix?

Joe