'assert.h' file not found

I'm trying to build C project with XCode 15.0, but always get error 'assert.h' file not found. I tried to clean and restart XCode, reinstall XCode and reboot, set different framework versions and project formats.

I found all entries of stdarg.h with Finder and made sure, that all directories, containing stdarg.h, contain also assert.h, but stdarg.h includes are resolved, assert.h - not. How could this be ? Many thanks for any help.

Ventura 13.6, M2, Command line tools version 2397

So, just to be clear, you still see this problem when you create a new project from the macOS > Command Line Tool template?

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Quinn “The Eskimo!” @ Developer Technical Support @ Apple
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'assert.h' file not found
 
 
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