IMO should be either
INCLUDEPATH += $$PWD/C_html4_tags/S_html_tag/C_html4_attributes/S_html_attr/S_html_attr_value
INCLUDEPATH += $$PWD/C_html4_tags/S_html_tag/C_html4_attributes/S_html_attr/S_html_attr_value
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and
#include "S_html_attr_value.h"
#include "S_html_attr_value.h"
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or
INCLUDEPATH += $$PWD/C_html4_tags/S_html_tag/C_html4_attributes/S_html_attr
INCLUDEPATH += $$PWD/C_html4_tags/S_html_tag/C_html4_attributes/S_html_attr
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and
#include "S_html_attr_value/S_html_attr_value.h"
#include "S_html_attr_value/S_html_attr_value.h"
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BTW, this:
Even that, I believe, is false, since I have built projects in Qt Creator before WITHOUT using the INCLUDEPATH variable (which is for qmake, btw, which is not a compiler...), and they worked and compiled just fine.
can be simply countered by the following trial: build the project without using QtCreator, with pure qmake && make call.
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