Mine

# Compiler Parameters
CFLAGS="-O3 -march=athlon64 -msse3 -pipe"
CXXFLAGS="${CFLAGS}"
LDFLAGS="-Wl,-O1 -Wl,--hash-style=both -Wl,--sort-common -s"
CHOST="x86_64-pc-linux-gnu"

# Keywords to accept
ACCEPT_KEYWORDS="~amd64"

# Setup the overlays
PORTDIR_OVERLAY="/usr/local/portage"
source /usr/portage/local/layman/make.conf

# Niceness and features
PORTAGE_NICENESS="10"
#FEATURES="distlocks"
PORTAGE_ELOG_CLASSES="warn error log"
PORTAGE_ELOG_SYSTEM="save"

# USE Variable                                                                                                                                                                                         
USE="nptlonly unicode"                                                                                                                                                        
USE="${USE} exif dbus hal -kde -qt3 -qt4 -arts tiff X usb pdf aac alsa aoss cdr directfb divx dvd dvdr dvdread firefox foomaticdb gif gtk gtk2 ieee1394 java javascript jpeg jpeg2k mime mp3 mpeg mpeg2 mplayer nsplugin nvidia png ogg opengl oss quicktime vorbis matroska glitz"

# Multiple Cores/CPUS (uncomment as necessary)
# 1 CPU: two cores
MAKEOPTS="-j3"

# Hardware
INPUT_DEVICES="keyboard mouse"
VIDEO_CARDS="nv vesa"
ALSA_CARDS="intel8x0"
FOO2ZJS_DEVICES="hp1020"

# GCC 4.2.0 Testing
#I_PROMISE_TO_SUPPLY_PATCHES_WITH_BUGS=1