given that FC3 ships with a preview gcc4, should it be considered a bug that glibc-2.3.3 can't be configured with that compiler? the relevant excerpt from glibc-2.3.3/configure: ac_prog_version=`$CC -v 2>&1 | sed -n 's/^.*version \([egcygnustpi-]*[0-9.]*\).*$/\1/p'` case $ac_prog_version in '') ac_prog_version="v. ?.??, bad"; ac_verc_fail=yes;; 3.[2-9]*) ac_prog_version="$ac_prog_version, ok"; ac_verc_fail=no;; *) ac_prog_version="$ac_prog_version, bad"; ac_verc_fail=yes;; esac in short, if it ain't 3.2.x -> 3.9.x, glibc configure fails. bug? feature? safeguard? rday