I stupidly made a stable world today with the following options in /etc/make.conf CFLAGS=3D -0 -pipe COPTFLAGS=3D -0 -pipe NOPROFILE=3D true There were errors that -0 was not recognised but I let the build finish and then changed the -0 to -O for the kernel build which is proceeding as I type. Is this likely to work, or should I rebuild the world? Thanks John.