Those packages look old and unmaintained. Please drop the dependencies on those packages and use EGO_VENDOR (from go eclasses) to fetch them.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=6d84151540921bdbf801e5e63bdc47f3953ded96 commit 6d84151540921bdbf801e5e63bdc47f3953ded96 Author: Manuel Rüger <mrueg@gentoo.org> AuthorDate: 2019-01-20 16:33:55 +0000 Commit: Manuel Rüger <mrueg@gentoo.org> CommitDate: 2019-01-20 16:34:47 +0000 dev-embedded/arduino-builder: Vendor gopackages Fixes: https://bugs.gentoo.org/670464 Package-Manager: Portage-2.3.56, Repoman-2.3.11 Signed-off-by: Manuel Rüger <mrueg@gentoo.org> dev-embedded/arduino-builder/Manifest | 3 + .../arduino-builder-1.4.1-r1.ebuild | 68 ++++++++++++++++++++++ 2 files changed, 71 insertions(+)