SRC_URI="mirror://gentoo/gentoo-headers-base-${PV}.tar.xz
${PATCH_VER:+mirror://gentoo/gentoo-headers-${PV}-${PATCH_VER}.tar.xz}"
SRC_URI="mirror://gentoo/gentoo-headers-base-${PV}.tar.xz
${PATCH_VER:+mirror://gentoo/gentoo-headers-${PV}-${PATCH_VER}.tar.xz}"