Hi, cool project. I could now compile without errors. Solution is at the bottom.
kind regards
error:
/opt/vc/include/interface/vmcs_host/vcgencmd.h:33:27: fatal error: vchost_config.h: Datei oder Verzeichnis nicht gefunden
solution:
add "-I/opt/vc/include/interface/vmcs_host/linux" to CFLAGS in Makefile.RPi