My guess is that you don't have the 32-bit version installed. Quake3 is 32 bit only. dfengine is based on the source release from 2004 and therefore inherits that flaw.
You can either install the 32-bit version of each lib the dfengine requires or you can change your client to a 64-bit based engine like ioquake3 or it's derivates (iodfe).
If you know how to compile it you should clone
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https://github.com/runaos/iodfe.git
If not, there is a download availible at:
https://github.com/runaos/iodfe/downloadsiodfe-v3-lin-x86_64.tar.gz
however, debian stable is pretty old. You might have to compile anyway.
You can also just install "ioquake3" from your repository. It works just as good but misses a few features like color 8 and 9 and fast map loading support.