[Qt-creator] Problem with compile simple code

[Coda Highland]

> Really? Is that why C++ libraries tend to use stub-include files with no
> extensions? Surely '.h' is consistent on all platforms?

It's not a case-sensitivity issue (C++ STL wasn't designed with
Windows in mind) but I don't know the true rationale. My hypotheses
include: .h is for C headers, not C++ headers; or the STL headers
don't have to actually exist on disk and are free to be provided by
the compiler. The truth may not be either of these. I don't know.

/s/ Adam