Gentoo qemu with utm.app

GCC optimization

file: /etc/portage/make.conf

COMMON_FLAGS="-O2 -pipe"
CFLAGS="${COMMON_FLAGS}"
CXXFLAGS="${COMMON_FLAGS}"
FCFLAGS="${COMMON_FLAGS}"
FFLAGS="${COMMON_FLAGS}"
LDFLAGS="-Wl,-O2 -Wl,--as-needed"
MAKEOPTS="-j8"
CHOST="aarch64-unknown-linux-gnu"

USE flags

file: /etc/portage/make.conf

INPUT_DEVICES="libinput"
VIDEO_CARDS="virgl"