As stated, the qscintilla-python package fails to install the .sip files that come with qscintilla. There doesn't appear to be even a useflag to enable their installation.
This is a recent regression.
The bug has been closed via the following commit(s): https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=0cd1aa857f8fd6ba0b31764a75534d1fd933a229 commit 0cd1aa857f8fd6ba0b31764a75534d1fd933a229 Author: Davide Pesavento <pesa@gentoo.org> AuthorDate: 2017-11-12 07:19:56 +0000 Commit: Davide Pesavento <pesa@gentoo.org> CommitDate: 2017-11-12 07:26:29 +0000 dev-python/qscintilla-python: install .sip files Closes: https://bugs.gentoo.org/636606 Package-Manager: Portage-2.3.13, Repoman-2.3.4 .../qscintilla-python-2.10.1-r1.ebuild | 88 ++++++++++++++++++++++ 1 file changed, 88 insertions(+)