Attempting to use kDevelop 5.3.2 with Audacity source code.
Audacity is written in C++ with automake.

The code builds successfully, but kDevelop underlines class name in every function definition.

Example:
In src/About.h

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class AboutDialog final : public wxDialogWrapper {
   DECLARE_DYNAMIC_CLASS(AboutDialog)

 public:
...


In src/About.cpp

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void AboutDialog::CreateCreditsList()
{


"AboutDialog" is underlined in the above with a red wavy line.

kDevelop offers a "hint" which is clearly wrong:

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Problem in Semantic analysis
Use of undeclared identifier 'AboutDialog'; did you mean
'std::AboutDialog'?
Hint: 'std::AboutDialog' declared here
See: AboutDialog.h :50


Clearly kDevelop can see the class declaration, and equally clearly "std::AboutDialog" is not declared anywhere.

I have tried adding "include paths" in "Configure > Language Support". I have tried every combination that I can think of but can't find the necessary incantation to make it work.

Try changing the "compiler for path" setting in the project configuration dialog.

I have three options for "compiler for path": GCC, Clang, None.
I have tried all three, but no difference.