GTK-2 has reached EOL, most applications should be now using GTK-3+.
But also, IUSE=mono depends on dev-dotnet/gtk-sharp which needs to be dropped as well.
Anthony, please check out the linked pull requests and ACK how to drop (mainly) gtksharp2 and/or gtk2 dependency from net-dns/avahi.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b5bc3082872a0bcc33dd7e88f81837f47a83d63d commit b5bc3082872a0bcc33dd7e88f81837f47a83d63d Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2021-03-27 21:29:08 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2021-04-24 15:48:47 +0000 net-dns/avahi: Drop 0.8-r2 Closes: https://bugs.gentoo.org/769062 Package-Manager: Portage-3.0.17, Repoman-3.0.2 Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org> net-dns/avahi/avahi-0.8-r2.ebuild | 213 -------------------------------------- net-dns/avahi/metadata.xml | 3 +- 2 files changed, 1 insertion(+), 215 deletions(-) Additionally, it has been referenced in the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=7ea047d9410f8fe5eff293aeb5ceaf65096a768a commit 7ea047d9410f8fe5eff293aeb5ceaf65096a768a Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2021-03-27 21:27:28 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2021-04-24 15:48:47 +0000 net-dns/avahi: Drop IUSE=gtk2 Bug: https://bugs.gentoo.org/769062 Package-Manager: Portage-3.0.17, Repoman-3.0.2 Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org> net-dns/avahi/avahi-0.8-r3.ebuild | 9 ++++----- 1 file changed, 4 insertions(+), 5 deletions(-) https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=93cf079ade538cae967e7d18adcf63d237681e09 commit 93cf079ade538cae967e7d18adcf63d237681e09 Author: Andreas Sturmlechner <asturm@gentoo.org> AuthorDate: 2021-03-27 21:25:07 +0000 Commit: Andreas Sturmlechner <asturm@gentoo.org> CommitDate: 2021-04-24 15:48:46 +0000 net-dns/avahi: hard-disable avahi-ui-sharp Bug: https://bugs.gentoo.org/769062 Package-Manager: Portage-3.0.17, Repoman-3.0.2 Signed-off-by: Andreas Sturmlechner <asturm@gentoo.org> net-dns/avahi/avahi-0.8-r3.ebuild | 211 +++++++++++++++++++++ .../files/avahi-0.8-disable-avahi-ui-sharp.patch | 57 ++++++ 2 files changed, 268 insertions(+)