Looking at the upstream (https://gitlab.gnome.org/GNOME/gcab), I can see that the current version 0.8 is over a year old. 1.0 was released about a year ago, and 1.2 just last month. Can you please upgrade to a newer version?
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=ad94d90fa3849239b889e939d395cc0d7a75cd2c commit ad94d90fa3849239b889e939d395cc0d7a75cd2c Author: Mart Raudsepp <leio@gentoo.org> AuthorDate: 2019-02-12 10:00:19 +0000 Commit: Mart Raudsepp <leio@gentoo.org> CommitDate: 2019-02-12 11:09:28 +0000 app-arch/gcab: bump to 1.2 Closes: https://bugs.gentoo.org/677454 Package-Manager: Portage-2.3.52, Repoman-2.3.12 Signed-off-by: Mart Raudsepp <leio@gentoo.org> app-arch/gcab/Manifest | 1 + app-arch/gcab/files/1.2-optional-vapi.patch | 44 +++++++++++++++++++++++++ app-arch/gcab/gcab-1.2.ebuild | 50 +++++++++++++++++++++++++++++ 3 files changed, 95 insertions(+)