Something

#ifdef HAVE_TOUCHPAD
#if !defined(BUTTON_TOPLEFT) || !defined(BUTTON_TOPMIDDLE) \
 || !defined(BUTTON_TOPRIGHT) || !defined(BUTTON_MIDLEFT) \
 || !defined(BUTTON_CENTER) || !defined(BUTTON_MIDRIGHT) \
 || !defined(BUTTON_BOTTOMLEFT) || !defined(BUTTON_BOTTOMMIDDLE) \
 || !defined(BUTTON_BOTTOMRIGHT)
#error Touchpad button mode BUTTON_* defines not set up correctly
#endif