Adding the -g flag turns on -DDEBUGGING immediately following the Configuration check for the optimize flags. If you want compile without -DDEBUGGING, you'll have to Configure by hand and remove the -DDEBUGGING from the cflags. If you're brave (or experienced in dealing with the config.sh file), you can edit the config.sh by hand and remove the -DDEBUGGING from it after completing a run of Configuration.