Howto enable Bird debug messages (DBG)

Hello all How can I enable the debug messages, printed with the macro DBG? I tried with: ./configure --enable-debug and adding: if test "$enable_debug" = yes ; then cat >>confdefs.h <<\_ACEOF #define DEBUGGING 1 + #define LOCAL_DEBUG 1 + #define GLOBAL_DEBUG 1 _ACEOF and starting with: bird -d ... or: bird -d -D /var/log/bird.debug But I never see the messages printed with "DBG". For example: sysdep/unix/main.c: DBG("Initializing.\n"); What do I do wrong? I use bird 1.1.6 on a Gentoo Linux system. Thanks for any help. Best regards Elmar