I'd prefer to set each symbol to '1' though:AC_DEFINE([HAVE_DEBUG_PAGE], [1], [Debugging Page Layer]) just to follow the standard in config.h symbols.
No problem with that, as long as you don't set the definition equal to 0 if the specific configure option is not available. The only requisite for #ifdef to return `true' is the presence of the define, whatever the value stored in it is.
-Aleksander
