Found the error:
When I took another close look at the 16F88.INC file I saw this line:
INCLUDE "p16F88.INC" ; MPASM Header
instead of the M16F88.INC for the PM, so I looked in the p16F88 file and then saw _INTRC_IO
I never noticed it before because LP HS and XT are the same and never used the internal osc before. Next time I'll wait till I'm fully awake and than read the file again before asking.
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