Please drop them. x86_64-pc-linux-gnu-gcc -DLOCALEDIR=\"\/usr/share/locale\" -DHAVE_CONFIG_H -I. -I. -I.. -march=native -O2 -g0 -Wall -O0 -g3 -ggdb3 -DDEBUG -c `test -f 'netcat.c' || echo './'`netcat.c
Fixed in -r3 by repurposing the USE flag, since the only thing it does in configure.ac is this: AC_ARG_ENABLE(debug, AC_HELP_STRING([--enable-debug], [enable debugging (requires GNU compiler, default: no)]), [CFLAGS="$CFLAGS -O0 -g3 -ggdb3 -DDEBUG"]) Only -DDEBUG should be of interest.