On 4 August 2015 at 10:28, Jonathan Wakely wrote: > > The command used by the configure test is: > > $CC $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS > > so have you set any of those environment variables? My libatomic/config.log shows no options after -g -O2, so I'm curious where the -pipe ... -march=i486 -mtune=i686 options are coming from.