What is this?
This is a modified copy of the Pawn compiler version 3.2.3664 by Compuphase that fixes some bugs and adds a few features.
The project was originally started as a set of patches aimed to create a compiler that would be compatible with the compiler used in SA-MP (San Andreas Multiplayer).
SA-MP uses a modified version of Pawn 3.2.3664  with Windows-only executables, and the developers said that they lost the source code for it which means it can't be ported to other platforms (e.g. Linux) and newly discovered bugs can't be fixed. So the main goal of the project is to re-create changes that were previously made by the devs as well as fix all known compiler bugs.
 It's worth noting that the version of the AMX embedded into the SA-MP server seems to be based on an older release of Pawn.