arm64 does not have any stable version for curl, so please stabilize =net-misc/curl-7.52.1-r1 for it
Need to add ~arm64 keyword first. commit 66f8c597cbf0663b1ede56a629b34ad22ac3a669 Author: Michael Weber <xmw@gentoo.org> Date: Fri Feb 10 00:25:42 2017 +0100 net-misc/curl: arm64 keyword (bug 606098 part 1). Package-Manager: Portage-2.3.3, Repoman-2.3.1
skip in favor of bug 610572.