Here's the make.conf from the box I am working on this issue.

make.conf (text/plain), 2.18 KB, created by Heavenly Avenger on 2011-04-11 12:20:22 UTC

# These settings were set by the catalyst build script that automatically
# built this stage.
# Please consult /usr/share/portage/config/make.conf.example for a more
# detailed example.
CFLAGS="-O3 -march=native -pipe -funroll-all-loops -fprefetch-loop-arrays -ftree-parallelize-loops=3 -ffast-math -DSQLITE_HAVE_ISNAN"
#CFLAGS="-O3 -march=native -pipe -funroll-all-loops -fprefetch-loop-arrays -ftree-parallelize-loops=3"
#CFLAGS="-O3 -march=k8 -pipe"

CXXFLAGS="${CFLAGS}"
# WARNING: Changing your CHOST is not something that should be done lightly.
# Please consult http://www.gentoo.org/doc/en/change-chost.xml before changing.
CHOST="i686-pc-linux-gnu"

#LDFLAGS="${LDFLAGS} -lgomp"
#LDFLAGS="-lgomp"
#LDFLAGS="-O3 -lgomp"
LDFLAGS="-O3"

GENTOO_MIRRORS="http://mirror.mcs.anl.gov/pub/gentoo/ rsync://mirror.mcs.anl.gov/gentoo/ ftp://mirror.mcs.anl.gov/pub/gentoo/ ftp://gentoo.chem.wisc.edu/gentoo/ rsync://gentoo.chem.wisc.edu/gentoo/ http://gentoo.chem.wisc.edu/gentoo/ http://www.cyberuse.com/gentoo/ http://gentoo.mirrors.easynews.com/linux/gentoo/ http://chi-10g-1-mirror.fastsoft.net/pub/linux/gentoo/gentoo-distfiles/ ftp://chi-10g-1-mirror.fastsoft.net/pub/linux/gentoo/gentoo-distfiles/ ftp://ftp.ussg.iu.edu/pub/linux/gentoo ftp://gentoo.mirrors.tds.net/gentoo rsync://gentoo.mirrors.tds.net/gentoo http://gentoo.mirrors.tds.net/gentoo ftp://ftp.lug.udel.edu/pub/gentoo/ http://mirror.lug.udel.edu/pub/gentoo/ rsync://gentoo.cs.uni.edu/gentoo-distfiles http://gentoo.cs.uni.edu/"

SYNC="rsync://rsync.us.gentoo.org/gentoo-portage"

MAKEOPTS="-j2"

USE="ipv6 fortran openmp -X -kde -gtk -gtk2 -alsa -arts -qt -qt3 -gnome -cups lzma lzo crypt bzip2 zlib bzlib ssl png readline perl python tcl ncurses snmp ruby curl bas-completion mmx -ldap gdbm threads xml cxx net mysql mmx mmxext 3dnow 3dnowext 3dnowprefetch sse sse2 ithreads bash-completion vim-pager maildrop spamassassin aio suexec apache2 bcmath cgi curlwrappers ftp gd mysqli mysqlnd sqlite sqlite3 zip odbc jpeg -xcb bittorrent gnutls expat cvs subversion fontconfig truetype"
# lm_sensors openntpd vim-syntax sensord

ACCEPT_KEYWORDS="~x86"

# Apache - Suexec stuff:
SUEXEC_DOCROOT="/home/"
SUEXEC_USERDIR="public_html"
SUEXEC_MINGID="100"
SUEXEC_MINUID="500"