I have ardour-5.12 from portage tree. While ebuild has slv2 in dependencies, runing '$ ldd /usr/lib64/ardour5/ardour-5.12.0', I get lilv in the list.
Thanks for reporting. media-libs/lilv is already mentioned in RDEPEND. I will remove slv2 soon...
Did not know. They are both in RDEPEND :)
fixed now