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Edit - Here's a summary of how to compile ZGE using FreePascal.
1 - Go to http://www.freepascal.org and download a Binary release for the platform of your choice.
2 - Run the installer and make sure to include the IDE and Utilities ( for fpcres.exe ).
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3 - Start the IDE and select Compiler from the Options menu.
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4 - In the Syntax tab set the Compiler Mode to "Delphi compatible" and enter "MINIMAL" in the Conditional defines field.
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5 - Open the Assembler tab, and set Assembler Reader to "Intel style assembler", then close the window.
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6 - To compile ZGE entirely, first select Open from the File menu, and add "*.dpr" to the filetypes.
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7 - Now open "ZzDC.dpr" from your subversion folder.
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8 - Finally, from the Compile menu select Compile.
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9 - Success!
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! Building a new Player.bin is most convenient using either makeFpcWin32.bat or makeFpcSDL.bat located in the Build folder of your subversion.
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Once build, move the newly created zzdc.exe to your ZGameEditor folder ( make sure to always use the latest Beta release! ) and rename it to Player.bin.
Good luck ~