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WRFDA Compile Error

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I'm trying to compile WRFDA with the GNU compiler suite (option 34). I've successfully compiled WRF and WPS (all are version 4.0). The WRFDA compiles fails with Error 2 and no other information. Further up (five to ten lines) in the compile log it says

No rule to make target 'copyfile.c' , needed by 'copyfile.o'. Stop.
Waiting for unfinished jobs....

Does anyone know what's causing this problem and/or how to fix it (so WRFDA compiles)?