I get a circular dependence:
* Error: circular dependencies:
('ebuild', '/', 'sys-devel/libtool-2.2.6a', 'merge') depends on
('ebuild', '/', 'app-arch/xz-utils-9999', 'merge') (buildtime)
('ebuild', '/', 'app-arch/xz-utils-9999', 'merge') depends on
('ebuild', '/', 'sys-devel/libtool-2.2.6a ...