qdoc does not generate HTML

Question

Even my question is similar to this one, the answer provided does not solve my issue.

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I'm trying to generate my first QDoc output. To test it, right now I have only one comment in main.cpp:

/*!
 * \brief main
 * \param argc
 * \param argv
 * \return
 *
 * bla bla bla
 */

int main(int argc, char *argv[])
{
    // ...

Here my config file:

#include(compat.qdocconf)
#include(fileextensions.qdocconf)
project = MyProject
outputdir   = docs
outputformats = HTML
headerdirs  = .
sourcedirs  = .
exampledirs = .
imagedirs   = ./images

Question #1: in the minimum example the project field is not present. But without it, running qdoc myproject.qdocconf I get:

qt.qdoc: "qdoc can't run; no project set in qdocconf file"

Question #2: with the project field set, this is the output:

qt.qdoc: Start qdoc for MyProject in dual process mode: generate phase.
qt.qdoc: No include paths passed to qdoc; guessing reasonable include paths
(qdoc) Could not find the module header in include paths for module "MyProject"   (include paths:  QList() )
       Artificial module header built from header dirs in qdocconf file
qt.qdoc: Parse source files for "MyProject"
qt.qdoc: Source files parsed for "MyProject"
qt.qdoc: End qdoc for MyProject in dual process mode: generate phase.

I'm not sure how to include paths. Here I cannot find such an include command. It creates the output docs directory but it's almost empty: just the myproject,index file is there.

What I have to do further to produce the HTML files?