That's pretty cool stuff.
I tried to build the API reference with doxygen.
What I did was really easy.

You must use the terminal.

1. Install doxygen.
sudo apt install doxygen

2. Install graphviz
sudo apt install graphviz

3. Go into the kstars directory and execute
doxygen -g doxy.cfg
You can choose every filename you want.

4. Make some changes to doxy.cfg
I made these changes:
PROJECT_NAME = "KStars"
OUTPUT_DIRECTORY = /home/your_name_here/doxy-kstars
RECURSIVE = YES

Save your changes.

5. Run
doxygen doxy.cfg

The result is in the ouput folder and you get a nice reference with graphs.

Enjoy!

There is certainly more to it. But I have no clue.

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