CM 12 Build Error

I am attempting to build CM 12 for my phone as the latest prebuilts I could find were all for CM11. I am following the Cyanogenmod Wiki build guide for my phone and my build errored out thusly:

Code:

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device/samsung/d710/selinux/system.te:2:ERROR 'unknown type system' at token ';' on line 11185:
allow system input_device:chr_file { read ioctl write open };
#line 1 "device/samsung/d710/selinux/system.te"
checkpolicy:  error(s) encountered while parsing configuration
make: *** [/home/sarah/android/system/out/target/product/d710/obj/ETC/sepolicy_intermediates/sepolicy] Error 1

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It seems odd that 'system' would be an unknown device type, and I haven't edited the file, this is all what downloaded automatically. What can I do to fix this?