This zip file contians the librairies needed to compile the IDE with win64 target OS debugging support on Windows. This will probably only work with Free Pascal 2.5.1 version posterior to 2010-11-26 (compiler, gdbint and ide directory changes from this date are necessary for the successful compilation of a win64 debug-capable IDE. Warning: I didn't really test the integrated debugger extensively yet, so there might be problems coming up. Unzip trhe zip file into libgdb directory at same level as ide, compiler and packages directories. Recompile first the compiler with a 'make cycle', use the new compiler to compile the packages, and finally the IDE. If all works correctly, opening fp executable and 'Help|About' should give you: Debugger GDB 7.2.50-20111105-cvs Enjoy, Pierre Muller 2010-11-27.