Kurok's QuakeC isn't open source, there are no .qc files for it.
.qc files do not have anything to do with the engine. The engine files are .c
Engine is written in C (and a bit of C++ for the PSP). This is the "binary" like glquake.exe would be on Windows (on the PSP it would be a pbp file, as I recall).
QuakeC is what makes a progs.dat file, files like weapon.qc, client.qc etc.
The Kurok PSP engine is open source. The QuakeC source (the game logic and so forth) wasn't released.
You can obtain the QuakeC source for Quake at
ftp://ftp.idsoftware.com/idstuff/unsup/progs106.zip
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