During the "configure" stage, code will look for specific system headers and things and being "not found" is ***not*** an error message. It is actually just information.
Only when the configure stage fails is the exact warning shown.
So please ignore all of the following not found:
Using Bundled PCRE2
-- Looking for dirent.h
-- Looking for dirent.h - found
-- Looking for inttypes.h
-- Looking for inttypes.h - found
-- Looking for sys/stat.h
-- Looking for sys/stat.h - found
-- Looking for unistd.h
-- Looking for unistd.h - found
-- Looking for windows.h
-- Looking for windows.h - not found
-- Looking for C++ include type_traits.h
-- Looking for C++ include type_traits.h - not found
-- Looking for C++ include bits/type_traits.h
-- Looking for C++ include bits/type_traits.h - not found
unless they actually result in the "configure stage" failing.
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