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MCUX 10.3.1 - How to fix not finding standard header files?

Question asked by David Rodgers on Apr 29, 2019
Latest reply on Aug 15, 2019 by Erich Styger

Odd thing that's happened that I haven't encountered before... I'm developing a new C project for a Kinetis K24, the project compiles, links, and debugs fine.  But the IDE has apparently lost track of where the standard header files are.  Example from one of my main header files:

IDE unable to locate standard header files


This then leads to all sorts of annoyance, especially when viewing code suggestions:

Unknown standard types because IDE can't find standard headers


Why can the IDE suddenly no longer find the standard header files?  Is there a simple way to investigate and fix this?  Thanks.