s/#undef *\([ABCDEFGHIJKLMNOPQRSTUVWXYZ_]\)/#undef LIBVNCSERVER_\1/ s/#define *\([ABCDEFGHIJKLMNOPQRSTUVWXYZ_][abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]*\)\(.*\)/#ifndef LIBVNCSERVER_\1 \ #define LIBVNCSERVER_\1 \2 \ #endif/