This is the message that it "spits" at me:
mingw32-make --C tools/lemon -f Makefile
mingw32-make[1]: Entering directory 'C:/GZdoom source/tools/lemon'
mingw32-make[1]: Makefile: No such file or directory.
mingw32-make[1]: *** No rule to make target 'Makefile'. Stop.
mingw32-make[1]: Leaving directory 'C:/GZdoom source/tools/lemon'
mingw32-make: *** [basetools] Error 2.
@atariangamer: I just browsed around, and GZdoom has its own forum.
By the way, I just successfully compiled a working .pk3 file for the original Zdoom flawlessly. So, it's not a bug with the actual software. I also posted a topic in the GZdoom forum after browsing and not finding any thing.