Doxygen tricks, how to remove File Documentation?

Question

I need to produce a report for a project which I've heavvily commented with Doxygen. Like here I'm experimenting some troubles.

Since the report must be at most 8 page long, I hacked the documentation make command as follows:

report:
    (cat doc/Doxyfile ;\
     echo "GENERATE_HTML=NO" ;\
     echo "GENERATE_LATEX=YES" ;\
     echo "INPUT=src/headers/doc.h" ;\
    ) | doxygen -

This trick, suggested by the doxygen documentation, allows me to consider only the src/headers/doc.h file, which contains only the @defgroup statements. In this way I can ignore all the header file documentation, which still gets analyzed when generating the html version:

doc:
    cat doc/Doxyfile | doxygen -

The only flaw of my evil plan comes from the File Documentation section, which still gets generated for the Pdf file. My last resource would be removing with a script the unwanted section, but I'm wondering if there's a better way to exclude it. Any hint?