10. Feature macros, generated from compile options. All start with "_HAVE_"
and go on with some roughly recognisable name. Driver macros, for
- router, transport and authentication drivers; names starting with "_DRVR_".
+ router, transport and authentication drivers; names starting with "_DRIVER_".
Option macros, for each configuration-file option; all start with "_OPT_".
Use the "-bP macros" command-line option to see what is present.