For march: x86-64
COMMON_FLAGS="-march=x86-64 -O2 -pipe"
USE="X widgets elogind tkip wep"
Desktop environment: Lumina
Find our gentoo binaries at bottom url. Hope they shorten your time of installation.
For march: BDVER3
COMMON_FLAGS="-march=bdver3 -O2 -pipe"
USE="X widgets elogind tkip wep"
Desktop environment: Lumina
References:
https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Stage
https://wiki.gentoo.org/wiki/Gentoo_Binary_Host_Quickstart
https://wiki.gentoo.org/wiki/Handbook:AMD64/Installation/Stage
https://wiki.gentoo.org/wiki/Gentoo_Binary_Host_Quickstart