SOLVED! :)
Please don't ask me why, but in TextMate 2 I've had a Variable TEXINPUTS set to '../common/:../build/include//'.
I do not remember ever having set this up myself and also looking at those weird relative paths I would not know what it would be for.
Anyways... when I disabled this variable TextMate decided that typesetting documents is fun again! Yay!!!
Thanks for your help anyways, Florian :)
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