I am trying to put the DHT22 on the Argon. I had it working, but it quit for some reason.
lib/PietteTech_DHT/PietteTech_DHT.cpp:89:11: 'sigPin' was not declared in this scope
That’s pretty much exactly what the compiler is asking with that error message. You need to define sigPin for the compiler.
You should use v0.0.10 of that library. That way the error message should vanish 
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