Emerging qwt-6.1.2-r2 fails due to src_prepare() not calling eapply_user. The other versions aren't affected.
commit 86240b12546f88bb4ed21028ddecbd00b7288fe3 Author: Lars Wendler <polynomial-c@gentoo.org> Date: Sat Jan 21 16:18:34 2017 x11-libs/qwt: Fixed incomplete EAPI-6 conversion (bug #606700). Package-Manager: Portage-2.3.3, Repoman-2.3.1